He ______ it on schedule, but somehow he fell behind.A．must have doneB．might finishC．could have finishedD．could finish-高中英语-n多题

◎ 题干

He ______ it on schedule, but somehow he fell behind.

A．must have done	B．might finish
C．could have finished	D．could finish

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◎ 解析

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