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I don’t know ______ he will come tomorrow. ______ he comes , I’ll tell you.
A.if ; WhetherB.whether; Whether
C.if ; ThatD.if ; If
D

试题分析:句意:我不知道是否他明天回来,如果他来了我将告诉你。if引导宾语从句翻译为是否,if引导条件状语从句翻译为如果。whether是否,只能引导宾语从句。根据句意,故选D。
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