题目内容
2．Mr Smith must have been to your home this morning．No，he_____，because he didn't know my address．（ ）
| A． | couldn't | B． | can't | C． | mustn't | D． | 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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