一道选择 There are some health problems that,when ___ in time,ca

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一道选择 There are some health problems that,when ___ in time,can become bigger ones later on.
正确选项是not treated但不明白为什么not having been treated不对呢
我感觉treat和become 有时间上的关系况且有一个later on,
还有就是they are having been done与they haven't been done意思上有区别吗、、、

not having been treated 不是不对,而是不及not treated 精炼
没有they are having been done这种动词形式

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