问题补充：
It isn quite that he will be present at the meeting.
A. sure
B. right
C. exact
D. certain
答案：
A. sure
B. right
C. exact
D. certain
解析：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.
