It （） three years since I joined the air force. 【be】 我加入空军已经三年了。
It （） three years since I joined the air force. 【be】 我加入空军已经三年了。
相关考题：
It is over two years since my brother ______the army.A. joinsB. joinedC. has joinedD. had joined
I'm amazed to hear from my school teacher again． ，it is ten years since we met last．A．InawordB．What’smoreC．That’stosayD．Believeitornot
I first heard this story _____ from a girl I had met in New York's Greenwich Village.A. since a few yearsB. a few years beforeC. for a few yearsD. a few years ago
I started my teaching career at the school. That was more than twenty years ago, and I _____ there ever since.A. wasB. had beenC. will beD. have been
The wealthy doctor has a __________ daughter.A、three-years-oldB、three years’ oldC、three-year-oldD、three-year old
I don’t _______ anything that’s happened over the past three years. A. regretB. relateC. regulateD. reject
I() to my hometown in three years. I miss my old friends badly.A.wentB.have beenC.haven’t beenD.was
By the time I left the school, she _______ English for three years. A.has teachedB.has taughtC.had teachedD.had taught
They have been in the Party for three years．（改为同义句）It__________ three years__________ they__________ the Party．
It is five years since I was__with them,so I don't know how they are getting along.A.out of controlB.out of the questionC.out of touchD.out of sight
How long have you worked here?（）A、Since about two years.B、I do not know.C、For about two years.D、Who knows.
单选题The last time I saw her was （） my brother"s wedding ceremony three years ago.AtoBatCinDduring
单选题We parted twenty years ago and I have been _____ with him ever since.Ain touchBout of touchCwithout touchDbeyond touch
单选题Others argue that since the earth has endured a long string of ice ages in the last two million to three million years, any warming is（）to be temporary.AseemedBlikelyCtendedDpossible
问答题Air quality in Britain has improved considerably in the last 30years. Total emissions of smoke in the air haverisen by over 85 per cent since 1950. The domestic (1)____smoking control program has been particularly important in (2)____achieving this result. London and other major cities are no (3)____longer have the dense smoke-laden “smogs” of the1950s, and in central London winter sunshine has (4)____increased about 70 per cent since 1958. (5)____ Since 1990, daily air pollution data from theBritish monitoring network has been made available (6)____to the public by the Department of the Environ-ment’s Air Quality Bulletins. These give the concen-trations of three main pollutants-ozone, nitrogendioxide and sulfur dioxide –and grade air qualityon a scale between “very weak” and “very (7)____good”. The information features in television andradio weather reports, appears in many national and (8)____local newspapers. Therefore, the data are available (9)____on a special free telephone number and on videotext systems. A comprehensive review of the issue of urbanair quality was published in January 1992. Threeindependent committees of which experts have been (10)____established to advise on different aspects of the problem, andwill set guidelines and targets for air quality. The network isalso being extended and upgraded at a cost of ￡10 million.