There are some health problems that,when_______in time,can become bigger ones later on.A.not treated B.not being treated C.not to be treated D.not having been 事件不是发生在将来的吗?为什么不选C

There are some health problems that,when_______in time,can become bigger ones later on.A.not treated B.not being treated C.not to be treated D.not having been 事件不是发生在将来的吗?为什么不选C
There are some health problems that,when_______in time,can become bigger ones later on.
A.not treated B.not being treated C.not to be treated D.not having been 事件不是发生在将来的吗?为什么不选C

There are some health problems that,when_______in time,can become bigger ones later on.A.not treated B.not being treated C.not to be treated D.not having been 事件不是发生在将来的吗?为什么不选C
这是时间状语从句,你可以这么看.When health problems are not treated in time,they can become bigger ones later on.

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，不是表示将来
句意为：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。

http://zhidao.baidu.com/question/157639460.html此回答的内容：
《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。如：
Sir ,do you have some documents to be typed?先生，你有文件要打吗？(是你有没有文件让别人，也就是我打？）
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http://zhidao.baidu.com/question/157639460.html此回答的内容：
《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。如：
Sir ,do you have some documents to be typed?先生，你有文件要打吗？(是你有没有文件让别人，也就是我打？）
Sir,do you have some documents to type?你有文件要打吗？
（是你自己有没有文件要打？）》
这是为什么不用《not to be treated（to be done）》的原因，句子的原本意思会变得。
我有一点点的英语语法基础，谢谢原回答者。

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