1、Anyone, once ____ positive..

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1、Anyone, once ____ positive for H7N9 flu virus, will receive free medical treatment from our government. A. to be tested B. being tested C. tested D. to test 2、请老师给给出关于什么时候直接填过去分词，什么时候用不定式将来时啊，不定式的完成事态啊，以及不定式原形，现在进行被动，以及各种时态。请老师详细解答。
1、我觉得A对着呢啊，一旦被检测出H7N9就会接受免费的医疗。事情没有发生，将要发生，不定式表示，而且与病人主语成被动关系用be tested。所以。我觉得是to be tested。 2、提供资料，需要详细的。最好老师自己总结的

解题思路：分词作条件、时间状语可等同于一个相应的状语从句
解题过程：
你好，此题考查非谓语动词。你的分析方向正确。
但，这里once引导的分词作状语应该用现在时表将来的用法。如果把还原为一个状语从句，就是Once he is tested，而不是once it is to be tested,不符合英语主将从现的时态原则。又比如：
When it is heated, ice will turn into water.当冰加热，它会变成水。（而不是when it is to heated)
If it is given water, the flower can grow better.
以上两句变成非谓语动词作状语取代状语从句的话，就是(When) heated 以及(if) Given,连词可有可无。
总之，当在条件、时间状语里，都考虑用分词，没有不定式的，因为是用现在时表将来的含义。更多例子：
While I was walking at the street,I saw my old friend.= （While) walking at ....
Once it is broken,the promise means nothing.=(once)broken
选C,你还有疑问吗？
最终答案：略

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