He was just falling asleep there was a loud knock on the door.A. whileB. whenC. thenD. un

发布时间：2020-08-23 12:05:51

He was just falling asleep      there was a loud knock on the door.
A. while
B. when
C. then
D. until

网友回答

A. while
(答案→)B. when
C. then
D. until
解析：句意：在他刚刚睡着的时候，有人在大声地敲门。be doing sth …when …正在做某事的时候，突然…，固定句型，此处的when表示“突然”，故选B
以上问题属网友观点，不代表本站立场，仅供参考！