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He was lucky enough to sell his bicycle for exactly _____为什么

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He was lucky enough to sell his bicycle for exactly _____为什么后面要填
What he had paid for it 而不是which he had paid for it
那为什么会由What引导。
这里无论用“what”还是“which”该从句都只能是介词For的宾语从句,属于名词性从句.因此以下我们要讨论的就是what和which在引导名词性从句是的区别,以判定在这句话中究竟应该用what还是which:
what引导的名词性从句有两种用法:
1.疑问代词,具有疑问含义,如:
I don't know what his name is.
我不知道他叫什么名字.(什么)
2.关系代词型what,相当于一个名词加一个定语从句
如本句中的what he had paid for it= the money that he had paid for it
what=the money that
而which所引导的名词性从句,which具有疑问的含义,“哪一个”,因此在此不可用.which在这里引导的不是定语从句,因此不能作其它的解释.