题目内容

This problem may lead to more serious ones if _______ unsolved.
A．makingB．remainedC．keepingD．left
D
本题句意“ 这个问题如果不处理，可能会导致更严重的问题”。句中if后省略了it is，remain是不及物动词，应先排除。而make和keep与it之间是被动关系，应用过去分词形式。故只能用leave，leave sth. done “使……处于某种状态”。
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