We were playing football on the playground__suddenly it began to _英语解答

We were playing football on the playground__suddenly it began to rain heavily.
A.as
B.until
C.while
D.when
选D
理由,关于句子的成分我不太很懂,请讲解的时候说清楚

人气：352 ℃　时间：2019-08-22 13:47:57

解答

when这个从属连词的其中一种用法是：表示其所引导的从句中提到的事情发生在主句活动、事件或情况的期间,翻译为“当.时”,并且从句中的动作往往是突发的、用一般过去时表达,本题正是此用法.其他三个连词无此用法.as和...