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 |
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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 |