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题目
题型:不详难度:来源:
Scientists say it will be five or six years __________ it is possible to test this medicine on humans.
A.afterB.beforeC.sinceD.when

答案
B
解析
    
试题分析:句意:科学家说还需要六年的时间才有可能在人身上实验这种药物。A在……之后;B在……之前;C自从;D当……时候。固定句型:it will be +时间段+before从句“还要多久才”。答案选B。
核心考点
试题【 Scientists say it will be five or six years __________ it is possible to test t】;主要考察你对连词等知识点的理解。[详细]
举一反三
______ we have enough evidence (证据), we can"t win the case.
A.OnceB.As long asC.UnlessD.Since

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He was about to tell me the secret ______ someone patted him on the shoulder.
A.asB.untilC.whenD.while

题型:不详难度:| 查看答案
Before long the Greens moved to a bigger city ____ the children could attend a better high school.
A.even ifB.so thatC.now thatD.as if

题型:不详难度:| 查看答案
— Will you go out to play for a while, Kate?
—Not         I finish all of my homework.
A.when B.ifC.afterD.unless

题型:不详难度:| 查看答案
It is already well understood        causes the global warming.
A.whatB.whenC.thatD.how

题型:不详难度:| 查看答案
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