I you somewhere before but your name has escaped me.A. must see;for a momentB. must have

问题补充：

I you somewhere before, but your name has escaped me.

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

答案：

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与不定式的完成时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。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”。