Can you solve such problems ___raised by the audience?
问题描述：
Can you solve such problems ___raised by the audience?
A.what were B.as were C.that were D.which were 请问为什么不是C
答
这是以as 引导的定语从句
从句中缺少主语,因此用关系代词,因为是such as 的固定搭配,因此不用that
而such that 是状语从句,必须在从句中不缺成分的时候使用
改为：
such problems that they were raised.才可以