We’re not sure _______ there’ll be _______ or not tomorrow.

A. if; rains B. if; rainy C. whether; raining D. whether; rain

D 【解析】句意：我們不確定明天是否會下雨�？疾檫B詞辨析和動詞時態(tài)辨析。if和whether表示“是否”可換用，但和or not連用時需用whether，可排除AB兩項。tomorrow用于一般將來時，be raining是進行時結(jié)構(gòu)，可排除。根據(jù)句意結(jié)構(gòu)，可知選D。
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B

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書面表達

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