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 If       unsolved,theproblemoffoodsafetymayleadtomores...

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问题详情:

 If       unsolved,theproblemoffoodsafetymayleadtomores...

 If        unsolved, the problem of food safety may lead to more serious results.

A. having left      B. to leave      C. left      D. leaving

【回答】

C

知识点:非谓语动词

题型:选择题

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