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为什么用which 不用what

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When deeply absobed in work , which he ofen was , he woule forget all about eating and sleeping.为什么用which 不用what 我知道这是定语从句用which代替前面那句话 但是不大理解为什么不用what,似懂非懂
解题思路: 定语从句
解题过程:
When deeply absobed in work , which he ofen was , he woule forget all about eating and sleeping.
he often was是定语从句,它的先行词是deeply absorbed in work,即非限制性定语从句。这样,它的引导词就只能用which了。
what不是定语从句的引导词,故而不能使用它。
最终答案:略