We were playing football on the playground__suddenly it began to rain heavily.A.asB.untilC.whileD.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

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We were playing football on the playground__suddenly it began to rain heavily.A.asB.untilC.whileD.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
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

We were playing football on the playground__suddenly it began to rain heavily.A.asB.untilC.whileD.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

我们正在踢球的时候下雨了
踢球这个动作发生在下雨前
A 表示正在……
B表示直到……时候
C表示动作同时发生
D表示……时候
正在做什么，，，，，，突然。。。。。“”用WHEN

首先，选D是必须的。
A as的意思是由于。
B 直到
C 这个题主要是却别when和whiel 前面两个根据意思就能排除。这里就简单讲下吧，一般是这样
while+进行时
when+一般时。
We were talking when the teacher comes in.
The teacher came in while ...

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首先，选D是必须的。
A as的意思是由于。
B 直到
C 这个题主要是却别when和whiel 前面两个根据意思就能排除。这里就简单讲下吧，一般是这样
while+进行时
when+一般时。
We were talking when the teacher comes in.
The teacher came in while we were talking.

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