He ______ it on schedule, but somehow he fell behind.A．must have doneB．might fin

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

上一题下一题 0.65难度单项选择更新时间:2017-08-16 05:15:07

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