---- I was falling asleep,there was a loud knock on the door

学习时间:2026-05-30 19:08:03 阅读：3997

____ I was falling asleep,there was a loud knock on the door.(when/while)

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2026-05-30 19:08:03

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_While___ I was falling asleep,there was a loud knock on the door。(when/while)因为只有while后面可以跟过去进行时,如果是when的话,后面应该用一般过去式。