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--It ____ Jack who is at the gate of the library.

--It ____ him. I saw him off at the railway station just an hour ago.

[  ]

A.can be; can't be

B.must be; can't be

C.can be; must have been

D.must be; can't have been

答案:
解析:

must用于表示肯定推断,意为“想必”“一定”,表示否定推断,不可能时却不用mustn't,而用can't。本题两处空白都是对现在情况的推断,故用不定式一般式。


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