题目内容
9．-Is that Mr Li under the tree？-No，it ______ be him．He's in the office now．（ ）
| A． | can't | B． | mustn't | C． | might | D． | must |
分析 句意：--树底下那个人是李老师吗？
--不，不可能是他．他现在在办公室里．
解答 答案：A．can't不可能；mustn't不可以，表示禁止；might可能；must一定，必须．根据He's in the office now，可知他现在在办公室里，树底下那个人不可能是李老师．can't不可能．故选A．
点评 本题考查了情态动词的用法．解答时注意对句意以及所给选项的意思的理解．
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