Can you solve such problems____were raised by the audience?

Can you solve such problems____raised by the audience?
A.what B.as C.that D.which
为什么不用that

该句是定语从句,as在从句中充当主语。
such…as…引导的定语从句与such…that…引导的状语从句的区别：
1、He is such a clever boy as every body likes.
2、He is such a clever boy that every body likes him.
第一个句子为定语从句，因为从句中缺少成分；而第二个句子不缺少任何成分。

正确答案是：b 这题考查的是定语从句，注意，因为先行词problem前面有such修饰,所以后面的定语从句只能由关系代词as来引导。记住，as引导限制性定语从句常用于such...as...这种结构。

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