题目内容
12．---It must be John who is in the office．---I'm sure it __________ be John．He left the building a quarter ago．（ ）
| A． | won't | B． | mustn't | C． | can't | D． | needn't |
分析 --在办公室里的那个人一定是John．
--我确信不可能是John．他一刻钟之前就离开了．
解答 答案：C．
won't将不会；mustn't不可以；can't不可能；needn't不必．根据He left the building a quarter ago．可知他一刻钟之前就离开了，所以不可能是John．can't不可能．故选C．
点评 本题考查了情态动词的用法．熟知句意以及所给选项的意思是解答本题的关键．
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