knock改为：knocking
因为后面是at 9：00具体的时刻,所以这里要用ing形式,表示那个时刻动作正在进行.
翻译：
昨天晚上九点钟的时候,我没有听见有人（正）在敲门.
I didn't hear anyone knock at the door at 9:00 yesterday evening
I didn't hear anyone knock at the door at 9:00 yesterday evening
改错
给我理由，敲门是瞬间的，hear sb do，应该没错啊
改错
给我理由，敲门是瞬间的，hear sb do，应该没错啊
英语人气：528 ℃时间：2020-02-03 13:05:43
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