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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】句意:我不知道他明天是否回来。如果他来了,我就告诉你。第一个空根据he will come tomorrow放在动词know 之后,故本句是一个宾语从句;根据句意,本句应填"是否"if或whether。又根据第二个句子的结构可知,本句应是以if 引导的条件状语从句,if 是"如果"的意思,而whether没有"如果"的意思,所以第二个空应填if。故答案选D。
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