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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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此题，把it替换成“the age of thirty”， 然后依次带入选项理解。
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