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【题目】This problem may lead to more serious ones if ________ unsolved.

A. making B. remained C. keep D. left

【答案】D

【解析】句意:如果这个问题仍然未被解决,将会导致更严重的问题。只有left和remain可以表示“剩下的”;条件从句是省略句,省略了主语和be动词,还原应为the problem is left unsolved. B项remain为不及物动词,不能用被动形式。故选D。

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