—What would you do if it tomorrow ?—We have to carry it on , since we’ve got everything r

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A. rain
(答案→)B. rains
C. will rain
D. is raining
解析：在if , when,before,as soon as, until,the moment 等引导条件、时间状语从句中常常用一般现在时表示将来。本句中it是第三人称单数，谓语动词后加s。