( ) We were walking along the river _____ it suddenly began to ra_英语解答

( ) We were walking along the river _____ it suddenly began to rain.A.as B.while C.when D.then

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解答

C
be doing when 正要干某事,突然.
B连接两个长动作,排除,D语意错误
A没有be doing as的结构
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