at 表示小的地点.
the door本身不大.
at也可表示指向某物,
"Did you heard someone knocking at the door?"为什么要用at?
"Did you heard someone knocking at the door?"为什么要用at?
RT
3Q
RT
3Q
英语人气：460 ℃时间：2019-11-07 17:16:27
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