He can't find his key.He ---------- them.A.must lost B.must have been lost C.must have lost
人气：373 ℃ 时间：2019-08-21 06:54:13
解答
He can't find his key.He ---C------- them.A.must lost B.must have been lost C.must have lostmust have done表推测已经发生的事情,“一定已经做过某事”A 错误 应该是must +动词原形B 错误 must have been lost...
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