I saw him leave the office an hour ago . He at this time . A．mustn''t be working B．can''t be workingC．can''t work D．may not being working 题目和参考答案——青夏教育精英家教网—

题目内容

I saw him leave the office an hour ago . He ____ at this time .

A．mustn''t be working	B．can''t be working
C．can''t work	D．may not being working

B。

must 表示猜测时只用于肯定句。may 可用于肯定句或否定句，但D项有明显错误。can 用于否定句中则表示“不可能”，本句的意义表示正在进行的动作，选C不合适。

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