________ is known to us all, our government has spared no efforts to control food prices.
A．WhatB．Which
C．AsD．It
C
C 考察非限制性定語從句。As放在句首，指代后面的整個句子，which通常放在主語后，what不引導定語從句，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。
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