题目内容：

It isn't quite___whether she will take the advice.
A.sure B.right C.certain D.exact 可以选A吗?

优质解答

答案是Csure 与certain 的唯一区别就是：It is certain thatb\不能换成suresure的主语只能是人.如 sb be sure /certain of/ about sthsb be sure /certain that...sb make sure / make certain...