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题库 / Prep2007E1-SC-24
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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被比较对象：employment costs
rise 这个动作不能说rise lower，lower一般用于数值上的高低；只能说rise的程度less
比较的rise为动作，后面用do的过去时did；
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