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英语
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i was sleeping late ___when _someone knocked on the door 为什么填when 而部填while 求详解
人气:397 ℃ 时间:2019-11-10 18:44:10
解答
因为主句是be doing,而从句是一般过去式
while则是从句主句都应该是一般过去式
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