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【题目】Our teacher is too busy. I'm not sure _______ he will come to the party or not.
A.when
B.that
C.until
D.whether

【答案】D
【解析】句意:我们老师太忙了,我不确定他是否会来参加聚会。when当……时;that只引导从句,无意义;until直到;whether是否,通常与or not连用构成固定搭配,所以答案是D。

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