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This problem may lead to more serious ones if_______ unsolved.

A.making B.left C.remained D.keeping 

B

解析试题分析:考查状语从句的省略句:句意:这个问题可能或导致更严重的病如果被任由不治疗的话。If left unsolved="if" the problem is left unsolved,如果主从句主语一致的时候,可以省略从句的主语和be动词,选B。
考点:考查状语从句的省略句

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