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


  1. A.
    making
  2. B.
    remained
  3. C.
    keeping
  4. D.
    left
D
解析:
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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