The baby was on the point of crying ____ her mother finally

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The baby was on the point of crying ____ her mother finally came home.
A.when B.unless C.while D.until
选A 为什么顺便翻译一下

这里是when引导的时间状语从句,选项中AC都可以引导时间状语从句
B更多的引导条件状语从句,如果选B,b是“除非”的意思,那这句话的意思就应该变成“除非他得妈妈回家,孩子就马上要哭了”,很别扭吧?而且从句中有finally,说明妈妈回家是事实,不是假设的条件；Duntil,引导这类从句通常是要not...until...这个句式,类似于“The baby didn't stop crying until her mother came home”,主句多是否定形式；
而while引导时间状语从句,从句多用延续性动词,表示主、从句的动作同时进行着；
when引导时间状语从句 ,表示“当……的时候”,相当于at the time that.从句的谓语动词是延续性的,也可以是非延续性的.它引导的时间状语从句常用一般现在时表示一般将来时；用一般过去时表示过去将来时；用现在完成时表示将来完成时.
When water becomes solid,we call it ice .当水变成固体的时候,我们就叫冰.
Don’t be afraid of asking for help when it is needed.当你需要帮助的时候,不要害怕请求帮助.

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