【題目】— 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：—這個星期天你打算干什么？—我不知道，因為我不確定那天是否會晴天。根據(jù)句意用 not sure 表示“不確定”，故選B.not sure后面跟if 或 whether引導的賓語從句。

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