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【题目】— What are you going to do this Sunday?
— I don't know because I'm __________ if it is sunny that day.
A.sure
B.not sure
C.think
D.believe

【答案】B
【解析】句意是:—这个星期天你打算干什么?—我不知道,因为我不确定那天是否会晴天。根据句意用 not sure 表示“不确定”,故选B.not sure后面跟if 或 whether引导的宾语从句。

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