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题库 / Prep2008E1-SC-240
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
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DE had been不对，是同一时间的比较，时态排除
ABC思考it指代的是what——the age of 30，依次带入（实际上是因为than作为比较结构，主从句的主语谓语都是 babies born to women所以全部省略
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