问题补充：
is known to us all, he is an excellent student in our class.
A. Who
B. That
C. Which
D. As
答案：
A. Who
B. That
C. Which
(答案→)D. As
解析：句意：我们都知道，他是我们班一个优秀的学生。这里用as引导定语从句，在定语从句中as做主语，而且修饰后面的主句内容，意思是“正如”，所以选D。
如果觉得《is known to us all he is an excellent student in our class.A. WhoB. ThatC. WhichD. As》对你有帮助，请点赞、收藏，并留下你的观点哦！
