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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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比较的是生孩子的女性的年龄分布，而不是不同年龄女性生的孩子数量
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