G-prep 雇佣成本上升

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

BCE中的it / were / were皆错

AD比较，就是搞不清costs该用less 还是lower修饰，如可以用lower，D的省略是否妥当？

请NN指点！

比较的烟雾单一些

比较的成份是percent或者说是上涨的幅度，而不是比较“上涨”本身

今年的 precent和去年的比较

D省掉了precent

前面是percent in the 12 months that ended in September

后面是precent in in the year that ended in the previous quarter.

precent重复，省了

这里比较的不是costs

而是costs今年和去年的上涨程度

用high

gonghao的意思是percent less than percent,对吧?

如果是A cost some money. 就要lower than B do了，cost和cost比，有lower对吧？

顺便问几个和percent / percentage有关的主谓一致问题，

one percent of the students

two percent of the stuents

large percentages of students

分别应该跟单数还是复数谓语？如students前面的the去掉有没有影响？

two percent of water又该如何跟？

请NN指点！

sorry，忘记说了，那到题目软件给出的答案是A

那就是我错了

再研究研究

我犯错了

sthA did sthB in 1970 is lower than that/those did in 1980

即使是名词也得有代词：

sth is bigger in 1970 than that （is）in 1980

Bob made greater success in 1970 than he did in 1980

是我犯得错，随意得省略

面壁～～～～

换句话说如果是precent的比较的话，

起码也得有代词，that/it

这里意思上是程度的比较，这点是正确的

costs只是这个Employment costs名词的一部分而已，是主语+动词rise的过去式rose

所以did是必须补齐的