1.还是用It.
口语的固定用法,楼主不要死套语法规定.
2.knock on和knock at表示“敲门/窗”时没有区别.
但是请注意knock的词性:
1）动词：sb be koncking at/on...
2）名词：there is a knock at/on...
Jack：Listen!There is someone knocking at the door.Who can it
2个回答
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