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    精英家教网 > 高中英语 > 题目详情
    The environmental problems in China may worsen if __________ unsolved.
    A．makingB．remainedC．keepingD．left
    D

    试题分析：考查动词和状语从句的省略式：句意：中国的环境问题如果任由不解决会更严重的。四个选项都可以接过去分词unsolved，make使得，但是应该是被动式，remain仍然，应该是主动式，keep保持，应该是被动，leave使…保持…状态，也是被动，只有D项符合。在if和left之间省略了they are。选D。
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