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The output of the paper mill is now three times as high as i

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The output of the paper mill is now three times as high as it was in 1966.
此句在in 1966前面用了it was.为什么呢?
the irrigated area in this place is four times bigger than in 1978.
为什么这句中in 1978前面没有it was
两句话加不加it was的区别在哪?
The output of the paper mill is now three times as high as i
as it was in 1966 是一个比较状语从句.it 指the output.这里的it was 可以省略.
the irrigated area in this place is four times bigger than in 1978.这里than后面省略了it was（即省略了主语和系动词）.
省略不省略it was意义没有舒适区别,不省略显得更正规,省略则显得更口语化.又如：
She is as beautiful as （she was） five years ago. 她跟五年前一样美丽.
Whe is as beautiful as (she was ) in 2003. 她跟2003年时的样子一样美丽.
The output of the paper mill is now three times as high as i The output of our factory is now three times what it was thr the tower of London is two times as high as the Church tower 翻译if an integer is three times as large as the sum of the fi The parcel is three times as light as that one. The distance of the sun from the earth is as much as 150mill as语法分析the bridge is three times as long as that one.three ti 英语语法请问costs the same as normal paper and is of equally high The number of the students in our school is three times as m 英语试题,.The cost of medical care today is five times as high a 翻译：The enlarged school campus is three times as big as the o The river is three times as long as that one的意思是?