____ I was falling asleep,there was a loud knock on the door.(when/while)
问题描述:
____ I was falling asleep,there was a loud knock on the door.(when/while)
答
_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.