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    精英家教网 > 高中英语 > 题目详情
    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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