Question

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

Answer 1

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"。