【題目】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:我們老師太忙了,我不確定他是否會來參加聚會。when當(dāng)……時;that只引導(dǎo)從句,無意義;until直到;whether是否,通常與or not連用構(gòu)成固定搭配,所以答案是D。

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