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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比较结构中是主语+不及物动词,后面可以省略主谓没有歧义
比较结构中是主语+不及物动词,后面可以省略主谓没有歧义
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