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If ____ unsolved, the problem of food sa...

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

A.making

B.remained

C.left

D.taking

 

C 【解析】考查省略句。The problem与leave构成被动关系,使用过去分词。完整的结构应该是If the problem is left unsolved, the problem of food safety may lead to more serious results.句意:如果这个问题被留在没有被解决,它会导致更严重的后果。
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