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.
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.
than
than born
than they were
than there had been
than had been born
答案A NN能不能分析一下,than THOSE under it中的THOSE是不是省略了?应该不可以省吧?