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    6．Experts warn that medical waste from hospitals，if___ properly，may lead to spreading diseases．（　　）
    A．not handledB．not being handled
    C．not to be handledD．not having handled

    分析 专家警告医院的医疗垃圾如果处理不当，有可能导致传播疾病．

    解答 答案：A
    解析：if引导的条件状语补充完整则是：if they are not handled properly．因为从句的主语与主句的主语一致且含有be动词，故可以将从句的主语与be动词一起省略，只保留其它部分．综上，本题答案为A选项．

    点评 本题考查省略句，做此类题目时一定要仔细分析句子结构，根据句意及语法等将句子还原为完整句子，再进行省略．

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