Between the two periods of classes is a break,___we can have a short rest.A then B where C when D which但我觉得选A也行,请问为什么?选A和C有何区别?

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Between the two periods of classes is a break,___we can have a short rest.A then B where C when D which但我觉得选A也行,请问为什么?选A和C有何区别?
Between the two periods of classes is a break,___we can have a short rest.
A then B where C when D which
但我觉得选A也行,请问为什么?选A和C有何区别?

Between the two periods of classes is a break,___we can have a short rest.A then B where C when D which但我觉得选A也行,请问为什么?选A和C有何区别?
这是一个非限制性定语从句,要用关系副词when来引导.
这个句子中,Between the two periods of classes is a break和we can have a short rest 是从属关系,后面的句子是用来修饰break的.这个句子主要的意思是在前面,在两堂课之前是课间休息.后面的从句(我们可以有短暂的休息)是对break的进一步说明.
then是一个连词,它连接的两个句子是并列关系,如:
We finished the first class,then we had a short rest.

这儿是两句话 需要个连词 then是一个副词不能连接两个句子 用and then 就可以

因为逗号前后是两个句子,英语中两个句子需要用连词来连接,而then 是个副词,不能连接两个句子 此句用when,引导的是定语从句

“在两节课中间有一段间隙,这段时间里我们可以休息一下。”这是个非限制性定语从句哈!或者翻译成:在两节课中间,有一段我们可以休息一下的间隙。 ..