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”。
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