一道英语单选题.It isn't quite ____ whether she will take the advice

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一道英语单选题.
It isn't quite ____ whether she will take the advice .
A,sure B,right
C,certain D,exact
Would you mind showing the reason

应该选c
It is…that结构中只能用certain,不能用sure.
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.
1．在“It is…that结构中只能用certain,不能用sure.
例如：
It is certain that he will come.
It was certain that our football team would win the game.
如是否定句,用whether,不同that.例如：
It is not certain whether he will come.
2．在祈使句中通常用sure,不用certain.例如：
Be sure to tell me all the news.
Be sure and come as soon as possible.
Be sure you don’t upset any of them.
3．作定语时,sure作“有把握的；肯定的；可靠的”解；certain作“某个；某些”解.例如：
Put it in a sure place.
There was only one sure way to succeed.
A certain person called on me yesterday.
Certain students have failed in the exam.
4．Sure在美语中可用作副词作肯定答语,用以代替surely,相当于certainly,of course；而certain则不能用作副词.例如：
I wonder if I could use your phone.
Sure.Go ahead.
Zhou Lan,can I have a look at your copy of China Daily?
Sure,go ahead.

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