题目内容

He must have finished the work yesterday,  ____ he ?
A．mustn'tB．haven'tC．didn'tD．hasn't
C
当陈述部分是must\may have done sth.时，如果有表示过去的时间状语，就用过去时来反问；如果没有表示过去的时间状语，就用现在完成时来反问.
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