题目内容
17．-Look，it _______ be our new headmaster．-It _______ be him．He went to Shanghai yesterday．（ ）
| A． | can't； mustn't | B． | can； can't | C． | must； can't | D． | must； may |
分析 --看，那一定是我们的新校长．
--不可能是他．他昨天去上海了．
解答 答案：C．
can't不可能；mustn't不可以；can可能；must一定；may可以．根据He went to Shanghai yesterday，可知他昨天去上海了．所以不可能是他，所以这里用can't表示不可能；再根据-Look，it _______ be our new headmaster这里表示一种肯定的推测，所以用must表示．故选C．
点评 本题考查了情态动词的用法．解答时注意理解句意以及所给选项的意思并作出正确选择．
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