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单选题
For years, doctors _____ millions of patients’ lives with the help of microscopes:
A

have saved

B

are saving

C

will save

D

were saving


参考答案

参考解析
解析:
句意:多年以来,医生们已经借助于显微镜挽救了数百万人的生命。状语是“多年来”,指从过去某一时刻开始起一直持续到现在,是典型的用来指导完成时的标志。A项是过去完成时,其他都不是。B项是现在进行时,表示正在进行的动作,不符合。C项是将来时。D项是过去进行时,表示过去某一时刻正在进行的动作,这三项都不符合。
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考题 单选题When was paper first created?A About 2000 years ago.B In the 19th century.C About 1000 years ago.D In the 11th century.

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考题 单选题Some sick people think of themselves as broken machines, which suggested that ______.A modem doctors should treat their patients as machinesB the level of the treatment was greatly improvedC they thought they were useless just like broken machinesD they were not satisfied with the manner in which doctors treated them

考题 单选题We provide doctors with instant access to patients’ medical histories ______ computer linkups.A intoB aboveC throughD down

考题 单选题It takes at least five to ten years______it is possible to test this medicine on human patients.A beforeB sinceC afterD when

考题 单选题Doctors give less importance to the communication between patients and doctors mainly because ______.A modem medical instruments are usedB they can cure more diseases and save more livesC they have much more medical experience than beforeD they are too busy to have time to talk with patients

考题 单选题Dr. Bruce Charlton would probably prefer to see a more formal relationship _____.A among doctorsB among managersC between doctors and managersD between doctors and patients