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I__________ you somewhere before, but your name has escaped me_________.
A.must see;for a momentB.must have seen; for a moment
C.must see;for the momentD.must have seen; for the moment
D
与不定式的完成时连用表示对过去发生的事持肯定态度的推断,在疑问句中用can,在持否定态度的推断时用can not。for a moment表示一个动作延续了一会儿,而for the moment则表示“目前;暂时”。
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