问题
选择题
It isn't quite _____ that he will be present at the meeting.
A．sure
B．right
C．exact
D．certain
答案
D. certain.
I am sure that +从句。He is sure to come. =" He" is certain to come.但在it作形式主语, that引导主语从句时, 主句中表语只能用certain, 不能用sure.
2－