This problem may lead to more serious ones if _____ unsolved.

A．makingB．leftC．remainedD．keeping

B

解析試題分析： 考查狀語(yǔ)從句的省略。Leave something +done 。題意 如果這個(gè)問(wèn)題不解決的話，會(huì)導(dǎo)致嚴(yán)重的問(wèn)題。
考點(diǎn) 狀語(yǔ)從句省略。

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