a)We were about to leave ____it began to rain.b)She thought

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a)We were about to leave ____it began to rain.b)She thought I was talking her son,_____,
in fact,I was talking about my son.
c)Hardly had I finished my composition ____ the bell rang.
A when B while C as D during
A B A请问为什么这样选?

第一个是A,began是短暂性动词,所以不能用B,所以是A
第二个,was talking是过去进行时,是延续性动词,所以可以用B,当然A也没什么大的错误.
第三个选A,rang是短暂性动词,所以是A

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