D
完成式表示已经发生
I seem to have heard.
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"what did you hear last night?""I seemes____someone knock at the door".
"what did you hear last night?""I seemes____someone knock at the door".
A.to hear
B.hear
C.having heard
D.to have heard
A.to hear
B.hear
C.having heard
D.to have heard
英语人气：379 ℃时间：2019-08-21 17:46:37
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