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
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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”。