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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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some uncountable nouns are plural. for instance, "taxes" is a plural noun, but the concept that it represents is uncountable (taxes are not things that you can separate into one, two, three,...)
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