you may call on me from one to five o'clock,during which time i am always at home.you may call on me from one to five o'clock,during ...i am always at home.A.which B.which time为什么不用which而要加time?

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you may call on me from one to five o'clock,during which time i am always at home.
you may call on me from one to five o'clock,during ...i am always at home.
A.which B.which time
为什么不用which而要加time?

简单的来说不看语法只看语境,就很明显能得出答案是B
which只是指哪一个,但是结合前面就知道要的是那一段时间,所以就是whtich time
这个时候可以把它理解成when

during介词,后面加WHICH+TIME=WHEN,但是句子中间有逗号,所以就用一个非限制性定语从句,就是以WHICH,WHO开头的从句。

可以简单理解为during when, 是“这段”,duiring which time 是“这段时间”。

因为during代表了时间,而且i am always at home修饰which