One evening he heard someone _____his door. He quickly opened the door and found a stranger. [ ]A. k

题目简介

One evening he heard someone _____his door. He quickly opened the door and found a stranger. [ ]A. k

题目详情

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
题型:单选题难度:中档来源:同步题

答案

B

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