【題目】 I don’t know _____ he will come or not tomorrow.

A. weather B. whether C. if D. that

【答案】B

【解析】

試題分析：句意：我不知道是否他明天回來。if引導(dǎo)賓語從句翻譯為是否。whether是否，只能引導(dǎo)賓語從句，可以和 or not連用，但是if不能。根據(jù)句意，故選B。

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