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问题: 英语语法

1、i have never been to the town about which(为什么不用what)you have talked so much.

2、it's a sort of day from which(为什么不用when)winter days are quite different.

3、There is no good reason which(为什么不用why)we could agree to.

解答:

1.因为该句是定语从句,需要用关系代词,what而不是关系代词;
2.when是副词,副词不能与像from一类的介词联用;
3.与第一题一样,why不是关系代词。