We were playing football on the playground__suddenly it bega

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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

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while引导的时间状语从句中往往是进行时态；until是“直到.”
We主语 were playing谓语动词 football 宾语 on the playground地点状语
when引导词 suddenly时间及方式状语 it 虚主语 began谓语动词 to rain heavily宾语；其中,heavily是动词rain的方式状语

We were playing football on the playground__suddenly it bega We were playing soccer on the playground when it started to we are playing football on the playground.(改为一般疑问句) we saw ______(he) playing football on the playground Though it rained heavily,( ) were still playing on the playg We were playing happily on the playground(同义句) We were ___ _ We saw the pupils are playing football. ;some are playing football on the playground we are playing football (happy) on the playground用适当形式填空 we are on the playground.look!Some boys are playing football we found many students playing football on the playground 的被改被动语态:We found many student playing football on the playgrou