【題目】He was just falling asleep________ there was a loud knock at the door.

A.when B.while C.as D.and

【答案】A

【解析】

試題分析： 句意：在他剛剛睡著的時(shí)候，有人在大聲地敲門(mén)。be doing sth …when …正在做某事的時(shí)候，突然……，固定句型，此處的when表示突然，所以答案為A。

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