The Craighead Caverns have been known________.A.through historyB.since the time of the Indian nationsC.since 1905D.since divers explored them
The Craighead Caverns have been known________.
A.through history
B.since the time of the Indian nations
C.since 1905
D.since divers explored them
B.since the time of the Indian nations
C.since 1905
D.since divers explored them
参考解析
解析：
相关考题：
“He was smoking.” “Then he () .” A.ought to have been not smokingB.ought to have not been smokingC.ought not to have been smokingD.ought to not have been smoking
This is the first time the students () to Hyde Park. A.have goneB.have been goneC.have been goingD.are being gone
Never before in China ________ for the farmers. A.has so much been doneB.have so much been doneC.has been done so muchD.so much have been done
Medical scientists __________ finding a cure for cancer since 1960s. A. have been working outB. have been workingC. have been working onD. have been building on
John told us that by the end of the year they _____ together for thirty years.A. would have been livingB. would have livedC. would have been livedD. will have been living
Perhaps the experiment _____ by this time tomorrow.A、has been doneB、will have been boneC、will doD、would have done
John and I ______ friends for eight years. We first went to know each other at a Christmas party. But we ______ each other a couple of times before that. A had been; have seenB have been; have seenC had been; had seenD have been; had seen
If only it ()so cold, perhaps I, too, ()more initiative.A、had been,have shownB、have been,would showC、had’t been,cound't have shownD、had't been,could have shown
What you saw can' t have been an aeroplane. I' m convincedit____ a large bird. A.must beB.has been builtC.must have beenD.could have been
This is the first time the students ______ to Hyde Park.A、have beenB、have been goneC、have been goingD、are being gone
The ship ______ on a low rock was broken in two by the waves．A.That had been drivenB.Had been drivenC.Have been drivenD.Which to have been driven
Deep inside a mountain near Sweetwater in East Tennessee is a bady?of water known as the Lost?Sea.It is listed by the Guinness Book of World Records as the world′s largest underground lake.The Lost Sea is part of an extensive and historic cave system called Craighead Caverns.The caverns have been known and used since the days of the Cherokee Indian nation.The cave?expands into a series of huge rooms from a small opening on the side of the mountain.Approximately?one mile from the entrance,in a room called-The Council Room",many Indian artifacts have been?found.Some of the items discovered include pottery,arrowheads,weapons,and jewelry.For many years there were persistent rumors of a large underground lake somewhere in a cave,but it was not discovered until 1905.In that year,a thirteen-year-old boy named Ben Sands crawled through a small opening three hundred feet underground.:He found himself in a large cave half filled?with water.Today tourists visit the Lost Sea and ride far out onto it in glass-bottomed boats powered by electric motors.More than thirteen acres of water have been mapped out so far and still no end to the lake has been found.Even though teams of divers have tried to explore the Lost Sea,the full extentof it is still unknown.What was found in"The Council Room"?A.A small natural opening.B.A large cave.C.Another series of rooms.D.Many old Indian objects.
Deep inside a mountain near Sweetwater in East Tennessee is a bady?of water known as the Lost?Sea.It is listed by the Guinness Book of World Records as the world′s largest underground lake.The Lost Sea is part of an extensive and historic cave system called Craighead Caverns.The caverns have been known and used since the days of the Cherokee Indian nation.The cave?expands into a series of huge rooms from a small opening on the side of the mountain.Approximately?one mile from the entrance,in a room called-The Council Room",many Indian artifacts have been?found.Some of the items discovered include pottery,arrowheads,weapons,and jewelry.For many years there were persistent rumors of a large underground lake somewhere in a cave,but it was not discovered until 1905.In that year,a thirteen-year-old boy named Ben Sands crawled through a small opening three hundred feet underground.:He found himself in a large cave half filled?with water.Today tourists visit the Lost Sea and ride far out onto it in glass-bottomed boats powered by electric motors.More than thirteen acres of water have been mapped out so far and still no end to the lake has been found.Even though teams of divers have tried to explore the Lost Sea,the full extentof it is still unknown.It can be inferred from the passage that the Craighead Caverns presently serve as__________.A.an underground testing siteB.an Indian meeting groundC.a tourist attractionD.a motor boat race course
It can be inferred from the passage that the Craighead Caverns presently serve as____.A.an underground testing siteB.an Indian meeting groundC.a tourist attractionD.a motor boat race course
While designing your database， you have created the EMPLOYEES table as an index/x7forganized table （IOT）. You want to create a bitmap index on the JOB_ID column to make queries faster. Which task must have been completed so that you are able to create the bitmap index？（）A、A primary key must have been created.B、A mapping table must have been created.C、An overflow tablespace must have been specified.D、The PCTTHRESHOLD option must have been specified.
Since 1991,the goals set in the plan（）A、have been largely achievedB、have largely not been achievedC、have been achieved in some significant areasD、have not been achieved at all
So far the construction of the two new bridges over the river （）.A、have been completedB、has been completedC、has completedD、have completed
While designing your database， you have created the EMPLOYEEStable as an index-organized （IOT）. You want to create a bitmap index on the JOD_IDcolumn to make queries faster. Which task must have been completed so that you are able to create the bitmap index？（）A、 A primary key must have been created.B、 A mapping table must have been created.C、 An overflow tablespace must have been specified.D、 The PCTTHRESHOLD option must have been specified.
单选题John, how lazy you are! This work ______ three days ago.Ashould have doneBmust have been doneCshould have been doneDmight have done
单选题I was on the highway when this car went past followed by a police car. They _____ at least 150 km an hour.Ashould have been goingBmust have been goingCcould have goneDwould have gone
单选题夹子用完了。（）AClamps have been used up.BLashing wires have been used up.CTwist locks have been used up.DTurnbuckles have been used up.
单选题While designing your database， you have created the EMPLOYEEStable as an index-organized （IOT）. You want to create a bitmap index on the JOD_IDcolumn to make queries faster. Which task must have been completed so that you are able to create the bitmap index？（）A A primary key must have been created.B A mapping table must have been created.C An overflow tablespace must have been specified.D The PCTTHRESHOLD option must have been specified.
单选题While several baseball teams have tried to supplant the Yankees as the dominant team in baseball, their inability has been unable to win even half as many World Series as the Yankees have won in the past one hundred years.Atheir inability has been unableBthe inability they possess has not been ableChaving been unableDthey were unableEthey have been unable