One evening he heard someone _____his door. He quickly opened the door and found a stranger. [ ]A. knocked at B. knocking at C. knocking into -初中英语-n多题

◎ 题干

One evening he heard someone _____ his door. He quickly opened the door and found a stranger.

[ ]

A. knocked at
B. knocking at
C. knocking into

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◎ 解析

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◎ 知识点

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