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—Whatareyoudoing,John?Whystop?—Tobeonthesafeside,we'dfi...

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—Whatareyoudoing,John?Whystop?—Tobeonthesafeside,we'dfi...

— What are you doing, John? Why stop?

— To be on the safe side, we'd fill up the tank now for we _______run out of gas on the way

   A. must        B. will        C. might        D. should

【回答】

C

知识点:情态动词

题型:选择题