Question

________ is known to us all, our government has spared no efforts to control food prices.

A. What B. Which

C. As D. It

 

Answer 1

C

【解析】C 考察非限制性定语从句。As放在句首，指代后面的整个句子，which通常放在主语后，what不引导定语从句，选what可以把句子改为What is is known to us all is that our government has spared no efforts to control food prices.故C正确。