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问题: 谁能告诉我这道英语题中which和as的区别?

"when is your husband's birthday?"
"The same day of my birthday,____I can't forget."
A.that B.when C.which D.as
答案是C,即使出现the same...也不能用as,它说是非限定性定语从句,但as可以引导非限定性定语从句啊.why?

解答:

个人看法:这里的the same是单独修饰day,后面没有出现需要as并列的成分,就是前面的词要和后面的词词性一致,类别一致,但本题中the same短语前面暗指birthday,可是后面是个句子,且与birthday类别不同。这里which是非限制性定语从句,修饰前面的birthday。而as引导的通常都代表后面或前面整个句子,很少单独指代某个词。如:As it's known to all, Changjiang River is the third longest river in the world.