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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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此句是修饰cost，用more / less； 如果是numbers 用higher / lower。 动词rose， 用 did。
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