Employment costs rose 2.8 percent in the 12 months that ended in September, slightly less than they did in the year that ended in the previous quarter.
less than they did
less than it did
less than they were
lower than
lower than they were
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比较的是增长的%, 用less而不是lower; than + 主语 + 宾语+ 比较的时间段
比较的是增长的%, 用less而不是lower; than + 主语 + 宾语+ 比较的时间段
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