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选哪个为什么?1.what happened yesterday?.we were planting tress___i

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选哪个为什么?
1.what happened yesterday?
.we were planting tress___it began to rain
A.while B.when C.as soon as D.until
选哪个为什么?1.what happened yesterday?.we were planting tress___i
B
前一句（我们正在植树）用的是过去进行时,表示过去某一时间内（正在）进行的动作,也可表示一个动作正在进行时,另一个动作发生了或一动作正在进行时,另一动作同时正在进行.
后一句（开始下雨了）用的是一般过去时,表示过去某个时间里发生的动作或状态.
由于前一句表达的是植树这个动作正在进行,所以下雨这个动作是发生在我们植树过程中的,这两个动作是同时发生的.
A、B都能表示两个动作同时进行,A后跟的是延续性动词,而开始下雨是非延续性的,只是一瞬间的,不可能一直都在开始下雨,B后可跟延续性动词也可跟非延续性动词,所以选择B
选哪个为什么?1.what happened yesterday?.we were planting tress___i what happened to them when they were rescued?we would Now we know what-----yesterday.A.was happened B.happened C.h what happened to him yesterday.为什么要用happened?happen可以吗 _____he came back home that we knew what had happened.为什么选It we don't know what has happened since yesterday since 不是跟延续性 英语翻译we were in the ending of the winter before what happened What were you doing yesterday afternoon?— We were singing __ -What happened to your brother yesterday mourning? What yesterday?a.happens b.happened He can't m- what happened yesterday. what happened while you were _the telephone?