the teacher asked such a difficult question _ no one in the class could answer答案是填as.为什么不是which?

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the teacher asked such a difficult question _ no one in the class could answer答案是填as.为什么不是which?
the teacher asked such a difficult question _ no one in the class could answer
答案是填as.为什么不是which?

the teacher asked such a difficult question _ no one in the class could answer答案是填as.为什么不是which?
引导限制性定语从句时,在such,as,the same后只能用as,其他情况用which
因为前面有 such 只能用 as