It isn't quite _____ that he will be present at the meeting.
A. sure B. right C. exact D. certain
It isn't quite _____ that he will be present at the meeting.
A. sure B. right C. exact D. certain
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.