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來(lái)。如果他來(lái)了,我就告訴你。第一個(gè)空根據(jù)he will come tomorrow放在動(dòng)詞know 之后,故本句是一個(gè)賓語(yǔ)從句;根據(jù)句意,本句應(yīng)填"是否"if或whether。又根據(jù)第二個(gè)句子的結(jié)構(gòu)可知,本句應(yīng)是以if 引導(dǎo)的條件狀語(yǔ)從句,if 是"如果"的意思,而whether沒(méi)有"如果"的意思,所以第二個(gè)空應(yīng)填if。故答案選D。
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