B
首先,根据句意,C和D不应该选.
然后比较A和B,A后面主要是持续性动词,B后既可以用持续性又用非持续性动词.而when还有一个特殊用法,还表示突然发生某事,意为“正在……忽然”；也可以表示过早发生某事,意为“还没（刚刚）……就”表示出现意想不到的情况.这里就是这种用法.
另外还要注意when的特殊用法和特殊词义.
4.He was just falling asleep------he heard someone knocking
1个回答
相关问题
-
He was just falling asleep when someone knocked at the door.
-
I was just falling asleep ____ there was a loud knock at the
-
he_asleep when there_aloud knock at the door. A was just fal
-
英语翻译2.John was very tired.He soon fell asleep.fall asleep:__
-
When he was walking past the house,he heard someone ______(p
-
He was heard_______just now.What happend?
-
Someone knocked on my door just now.But he left ------ I cou
-
Mr Zhou （）（fall）asleep while he was watching TV 动词填空...
-
Beethoven was walking in the street _______ he heard someone
-
英语翻译1.When he was walking in the street,he heard someone ___