they stayed with me for two weeks,____they did all the house

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/26 06:33:46

they stayed with me for two weeks,____they did all the housework
A、at which B、during when C、during which D、during that time
我想知道为什么不能用at?
为什么要用which?不能用when吗?they did all the housework句子结构不是完整了吗,结构完整不是应该用when吗?

这句是个非限制性定语从句,先行词是two weeks,而后面的定语从句缺个时间状语,应该是这样：They did all the housework during two weeks.同时during提前,指物的情况下只能用which,不能用at,at表示一般表示具体的时间点,不搭配.在这里也可以直接用when.when= during which.

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