What did you hear last night?" "I seemed someone knock at the door."A hearB.to have heardC.to hearD.having heard

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What did you hear last night?

What did you hear last night?" "I seemed someone knock at the door."A hearB.to have heardC.to hearD.having heard
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

What did you hear last night?" "I seemed someone knock at the door."A hearB.to have heardC.to hearD.having heard
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.

What did you hear last night?" "I seemed to hear someone knock at the door."
A hear
B. to have heard
C. to hear
D. having heard
seem to do sth. 是固定结构 。
我是从事英语的。答案满意吧。

C seem to do sth.