楼主可以这样想
「他进来的时候没有敲门」
那楼主想起来他进来是之前的事,所以是过去式enter＋ed
但是敲门对于进来是同时的,所以knock＋ing啊
我总觉得楼上的太多术语了
楼主懂了不?
He entered without knocking at the door 这句中 knock 后面是不是应该加ed
1个回答
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