____ I was falling asleep,there was a loud knock on the door
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____ I was falling asleep,there was a loud knock on the door.(when/while)
_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.
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.
____ I was falling asleep,there was a loud knock on the door
there was a knock on the door.
He was about to go to bed ____ there was a knock on the door
He was sleeping when there was a loud knock at the door.[对sl
1.S_____ there was a knock on the door.
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There came a knock on the door
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