Although there is no life on Mars now , some scientists think that there

题型：不详难度：来源：

Although there is no life on Mars now , some scientists think that there some form of life a long time ago .

A．must be

B．may have been

C．can have been

D．could be

答案

解析

略

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 taken	B．would take
C．should have taken	D．could take

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I suggested not only _____ go to the meeting but also give a speech there.

A．did he go

B．his going

C．should he go

D．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 standing	B．needn’t be standing
C．won’t be standing	D．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’t

B．must

C．couldn’t

D．might

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—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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