题目内容
16．-Is the man at the gate our headmaster？-No，it ______ be him．He has left for Fuzhou just now．（ ）
| A． | must | B． | can't | C． | may not |
分析 --在大门口的那个人是我们的校长吗？
--不，不可能是他．他刚刚离开启程去福州了．
解答 答案：B．
may not可能不；must必须，一定；can't不可能．根据He has left for Fuzhou just now，可知他刚刚离开启程去福州了，所以在大门口的那个人是不可能我们的校长．can't不可能，故选B．
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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