一道关于“比较”的 prep07语法题目： Employment costs rose 2.8 percent in the 12 months that e

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一道关于“比较”的  prep07语法题目

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.

A, less than they did

B, less than it did

C, less than they were

D, lower than

E, lower than they were

答案是A。

做题时在选项AD之间纠结， Ron在外网论坛上说： lower不能修饰动词， 因此less好于lower， 选择选项A。

我有一个问题：

如果划线部分是 " less than " , 把“ they did” 省略， 句子是符合逻辑的吗？

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.

希望大家能来指导交流一下，谢谢！