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 考察非限制性定語從句。As放在句首，指代后面的整個(gè)句子，which通常放在主語后，what不引導(dǎo)定語從句，選what可以把句子改為What is is known to us all is that our government has spared no efforts to control food prices.故C正確。