来自潘志强的问题
【填什么?Hewasabouttogotobed______thedoorbellrang.Hewasabouttogotobed______thedoorbellrang.A.whileB.asC.untilD.when】
填什么?Hewasabouttogotobed______thedoorbellrang.
Hewasabouttogotobed______thedoorbellrang.
A.whileB.asC.untilD.when

