____ is well-know to all,too much stress can cause disease.
问题描述：
____ is well-know to all,too much stress can cause disease.
A That B It C As D Which
请问为什么要选C As
答
引导一个非限定定语从句,as指代后面的部分,其他选项不可以
as is well-know to all,众所周知.也可以当成一个句型来记