33._____the average,the people’s income has been improved.A.In B.With C.On D.By选哪个,为什么?

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33._____the average,the people’s income has been improved.A.In B.With C.On D.By选哪个,为什么?
33._____the average,the people’s income has been improved.
A.In B.With C.On D.By
选哪个,为什么?

33._____the average,the people’s income has been improved.A.In B.With C.On D.By选哪个,为什么?
on average
平均上
on an average
平均而言
on the average
平均而言
用on 是固定结构,用其他的不对,讲不通了

选C
On the average一般说来,平均(固定词组)

C
固定搭配
on the average
平均, 按平均数计算; 一般地说