I _____ you somewhere before , but your name has escaped me _____ moment .
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
must與不定式的完成體連用表示對過去發(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)度的推斷時用can not 。例如：He must have rid himself of his preumonia last week , for you see , he doesn't cough at all now . (他在上星期肯定治愈了他的肺炎，你看，他現(xiàn)在一點都不咳嗽了。) for a moment表示一個動作延續(xù)了一會兒，而for the moment 則表示"目前；暫時"。
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