He can't find his key.He ---C------- them.
A.must lost B.must have been lost C.must have lost
must 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 被动结构,“肯定被丢失”,而句子主语是He,指人
故选C
He can't find his key.He ---------- them.A.must lost B.must
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