9.There are some health problems that, when _C___in time, can become bagger ones later on.
A.not treated B,not being treated C.not to be treated D.not having been treated


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祝学习进步其实答案是A我是觉得后面有个later on；所以应该有将来的意思；所以用了to be treated但真的是A。。。状语从句省略主+BE,=when they are nottreadted...译：有一些如不及时治疗以后会变得更糟糕的健康问题。评：将when改成if是不是更好些。析：如果用not being treated, 则还原成：when they are not being treated...是正在进行的被动语态，不当。When not having been treated =when they are not having been treated ..., 没有这样的时态语态结构。注：when有时有“在。。。的情况下”的意思，相当于，if,也可以译作如果