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
與不定式的完成時(shí)連用表示對(duì)過去發(fā)生的事持肯定態(tài)度的推斷，在疑問句中用can，在持否定態(tài)度的推斷時(shí)用can not。for a moment表示一個(gè)動(dòng)作延續(xù)了一會(huì)兒，而for the moment則表示“目前；暫時(shí)”。
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