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

____ I was falling asleep,there was a loud knock on the door.(when/while)
英语人气:221 ℃时间:2019-09-09 18:11:06
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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.
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