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先生早晨一定去過你家里了.
--不,不可能,因為他不知道我的地址.

解答 答案:A.
couldn't不可能,用在一般過去時中;can't不可能;mustn't不可以;may not可能不.根據(jù)because he didn't know my address,可知,因為他不知道我的地址,所以Smith先生早晨不可能去過家里,在這里是一般過去時,所以前面也用一般過去式,couldn't不可能.故選A.

點評 本題考查了情態(tài)動詞的用法.解答時注意了解句意以及所給選項的意思并作出正確選擇.

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