I don’t know ______ he will come tomorrow. ______ he comes , I’ll tell you.

A．if ; Whether B．whether; Whether
C．if ; That D．if ; If

D

解析試題分析：句意：我不知道是否他明天回來，如果他來了我將告訴你。if引導(dǎo)賓語從句翻譯為是否，if引導(dǎo)條件狀語從句翻譯為如果。whether是否，只能引導(dǎo)賓語從句。根據(jù)句意，故選D。
考點(diǎn)：考查連接詞的用法

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