题目内容
19．---The light in the office is still on．Who _____ it be？Is it Mr Wu，our headmaster？---No．It_____be him．I saw him in the classroom just now．（ ）
| A． | can； can't | B． | may； won't | C． | may； mustn't | D． | can； mustn't |
分析 --办公室里的灯仍然在开着．可能是谁？是我们的班主任胡老师吗？
--不，不可能是他．我刚刚看到他在教室里．
解答 答案：A．
can可能；may可以；can't不可能；won't将不会；mustn't不可以．根据Is it Mr Wu，our headmaster，这里是一个一般疑问句，表示对所说的事实有疑问，所以这里用can表示；再根据I saw him in the classroom just now，可知我刚刚看到他在教室里，所以不可能是他，所以这里用can't．故选A．
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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