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.
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less than it did
less than they were
lower than
lower than they were
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lower 是个形容词或者动词,did是个动词需要副词less修饰
lower 是个形容词或者动词,did是个动词需要副词less修饰
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