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题目
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Although there is no life on Mars now , some scientists think that there        some form of life a long time ago .
A.must beB.may have beenC.can have been D.could be

答案
B
解析

核心考点
试题【Although there is no life on Mars now , some scientists think that there        】;主要考察你对虚拟语气等知识点的理解。[详细]
举一反三
—I went to work on foot yesterday, though it was raining cats and dogs.
—You      a bus. You were likely to get a cold.
A.must have takenB.would take
C.should have takenD.could take

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I suggested not only _____ go to the meeting but also give a speech there.
A.did he goB.his goingC.should he goD.he should go

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We          here in the rain. We might take shelter in the house over there .
A.mustn’t be standingB.needn’t be standing
C.won’t be standingD.may not be standing

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—Have you found out anything, sir?
—We are sure that the thief entered the house through the window instead of breaking in. You              have closed the window before you left.
A.shouldn’tB.mustC.couldn’tD.might

题型:不详难度:| 查看答案

—Do you mind my opening the window?
—Well , I’ d rather you _____.
A.didn’t B.not C.won’t D.don’t

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