问题
选择题
______is known to us, he is the top student of our class.
A.It
B.As
C.This
D.That
答案
答案:B
考查非限制性定语从句。此处as代替he is the top student of our class.句意:他是我们班里的优秀学生,这一点我们都知道。如果用A项句型It is known to us that-----.