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It isn’t quite         whether the teacher will collect the homework by Friday, so you needn’t hurry.
A.sureB.rightC.certainD.exact
C

试题分析:考查形容词:A. sure当然,主语是人,B. right正确的,C. certain确定的,主语可以是人或it,D. exact确切的,这是个句型:It’s certain that…,肯定的是…,句意:是否老师会在周五前完成作业还不确定,所以我们不要着急。选C。
点评:Sure与certain是近义词,均作“一定的,确信的”等解。两者用法相似,多数情况下可换用,但有时不能换用。It is…that结构中只能用certain,不能用sure。
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