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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 表示猜測時只用于肯定句。may 可用于肯定句或否定句，但D項有明顯錯誤。can 用于否定句中則表示“不可能”，本句的意義表示正在進行的動作，選C不合適。
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