题目

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

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