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2.Mr Smith must have been to your home this morning.
No,he_____,because he didn't know my address.(  )
A.couldn'tB.can'tC.mustn'tD.may not

分析 --Smith先生早晨一定去过你家里了.
--不,不可能,因为他不知道我的地址.

解答 答案:A.
couldn't不可能,用在一般过去时中;can't不可能;mustn't不可以;may not可能不.根据because he didn't know my address,可知,因为他不知道我的地址,所以Smith先生早晨不可能去过家里,在这里是一般过去时,所以前面也用一般过去式,couldn't不可能.故选A.

点评 本题考查了情态动词的用法.解答时注意了解句意以及所给选项的意思并作出正确选择.

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