prep模考上的一道题 真心不懂

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如题:

according to  public health officials, in 1998 massachusetts became the first state in which more babies were born to women over the age of thirty than under it

a than

b than born

我觉得more是放在babies 前面 所以than的比较是baby 和baby 的比较，就选了b.

a是生孩子的妇女年龄的比较。应该省略一串东西，想请问怎么补会这串东西好让句子更好理解？

谢谢！

板栗在奋斗

主谓前后都一样的话，可以省略后面的那个主谓部分，只留下谓语不伦不类的。而且谓语也是were born。

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哦 一直记得的是主语相同省主语。 懂了 谢谢哈~