This problem may lead to more serious ones if ____ unsolved.
A．makingB．remainedC．keepingD．left
D
本題考查省略句的用法。此處完整的句子應為：This problem may lead to more serious ones if it is left unsolved.在從句中如果主語與主句的主語一致時，常將從句的主語和謂語的一部分省略。
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