It is -- that people will not agree with what the

问题补充：

It is -- that people will not agree with what the manager said at the meetingIt is ----- that people will not agree with what the manager said at the meeting.A、sureB、certain

答案：

certain

在“It is…that结构中只能用certain,不能用sure.

sure与certain虽可换用,但隐含意思不同.Sure表示主观的推测或感觉,所述事实并不一定如此.certain则指说话者有充分的理由或根据,肯定某事会发生.