Can you solve such problems____were raised by the audience?

题目

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

答案

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.