题目内容
17．Our math teacher went to Beijing just now．He ______ be in his office at present．（ ）| A． | may not | B． | can't | C． | mustn't | D． | needn't |
分析 我们的数学老师刚刚去北京了．现在他不可能在办公室里．
解答 答案：B．may not可以不；can't不可能；mustn't不可以；needn't不必．根据Our math teacher went to Beijing just now，可知数学老师刚刚去北京了，所以不可能在办公室里．can't不可能．故选B．
点评 本题考查了情态动词的用法．解答时注意区分辨别句意以及所给选项的意思和用法．
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