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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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看见than 首先想到比较对象一致的考点；
比较对象：Employment costs rose 2.8 percent 复数主语+动词
所以后面肯定是they did 直接排除BCDE。
另外lower 是形容词不能修饰动词。
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