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。Leave something +done 。題意 如果這個問題不解決的話，會導(dǎo)致嚴重的問題。
考點 狀語從句省略。
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