I you somewhere before , but your name has escaped me moment . A. must see ; for a momen

网友回答

A. must see ; for a moment
B. must have seen ; for a moment
C. must see ; for the moment
(答案→)D. must have seen ; for the moment
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。