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    3．There are some health problems that，when ________ in time，can become bigger ones later on．（　　）
    A．not treatedB．not being treated
    C．not to be treatedD．not having been treated

    分析 有一些健康问题，当他们不能被及时治疗时，随后会发展成更大的问题．

    解答 答案：A．
    原来完整的句子为There are some health problems that，when it is not treated in time，can become bigger ones later on．这里省略了 it is．表示被动，属于状语从句的省略用法．to be done 表将来和被动，常用作宾语补足语．表示主语让别人做，to do主语亲自做．用在此处不合适；故选A．

    点评 在时间、条件、让步等状语从句中，如果从句的主语和主句的主语一直，且从句中含有be动词，或者从句中主语为it时，可以省略从句中的主语和be动词．

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