4.He was just falling asleep------he heard someone knocking

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4.He was just falling asleep------he heard someone knocking at the door .
A .while B.when C .before D.after

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 He was just falling asleep when someone knocked at the door. ( ) Someone knocked at the door ______ he was asleep. he was just falling ( )when the telephone rang I----------just-----------(fall)asleep when I heard someone 连词成句:was,he,sleepy,so,he,that,he,himself,bed,just,asleep,mom he heard someone call him.He stopped_______ He heard someone ( ) help when he was walking along the rive I heard someone _____(knock /knocking) at the door just now I heard someone ____(knocking/knocked)at the door just now. Kitty lay in bed .Kitty heard someone was knocking on the do he was heard singing=he was heard to sing?