I _____ you somewhere before , but your name has escaped me _____ moment .
A.must see ; for a moment
B.must have seen ; for a moment
C.must see ; for the moment
D.must have seen ; for the moment
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D解析must与不定式的完成体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 。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，他现在一点都不咳嗽了。) 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。