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This problem may lead to more serious ones if_______ unsolved.
A．makingB．leftC．remainedD．keeping
B

試題分析：考查狀語從句的省略句：句意：這個問題可能或導致更嚴重的病如果被任由不治療的話。If left unsolved="if" the problem is left unsolved，如果主從句主語一致的時候，可以省略從句的主語和be動詞，選B。
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