大家一起来讨论 tt31:gwd-16-30

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.

1. than
2. than born
3. than they were
4. than there had been
5. than had been born

   Answer: A

B的问题是什么呢？

which后面的从句主语是babies, 因为主语及谓语相同的情况之下，若不产生歧异都可以省略。省略之前的句子应该是more babies were born to women over the age of thirty than (babies were born to women) under it. 括号的地方都省略了，只剩born没省略很奇怪所以排除了。这是我的理解