Whatdidyouhearlastnight?""Iseemedsomeoneknockatthedoor."AhearB.tohaveheardC.tohearD.havingheard
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题目内容：
What did you hear last night?" "I seemed someone knock at the door."
A hear
B.to have heard
C.to hear
D.having heard
优质解答
答案是B.因为seem 后跟不定式,在这里要用不定式的完成式,表示的是hear所表示的动作发生在谓语动词seem 之前.
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