Are you {{U}}positive{{/U}} that there's been no mistake?

题库:综合类 类型:最佳选择题 时间:2017-07-03 03:14:05 免费下载:《单选题》Word试卷

Are you {{U}}positive{{/U}} that there's been no mistake?
A.rational
B.reasonable
C.certain
D.bound

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