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1 I lived on the farm for ten years,during which time I led

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1 I lived on the farm for ten years,during which time I led a happy life.
为什么which后面一定要有time?
2 Can I help you,sir?
Yes,I bought this radio here yesterday,but it ( ).
A didn`t work B won`t work C can`t work D doesn`t
答案给的是D 但我同桌说B好像也行,这是怎么回事
3 用法?
4 average与common什么区别,总是分不清啊.
3怪我没有表述清楚 是这样的
The best times to visit Shangri-la( )spring and autumn because the temperature is at it mildest
空格填的是are 不太理解这个times的意思与用法。
1、在非限制性定语从句中,which作为一个引导词,后面要加名词,这里指的是前面的那段时间,故用time代替前面的意思;
2、说明某样东西运作不了,常用一般式,动词用work,若用won't work语意不恰,won't表将来之意;
3、time时间,一般加s,表倍数,常见用法有:
倍数表达法有三种:
倍数+原级 倍数+比较级 倍数+名词短语
例如:和---三倍一样长
1.three times as long as
2.three times longer than
3.three times the length of
再如:和---四倍一样宽
1.four times as wide as
2.three times wider than
3.three times the width of
common
意为"共同的,普遍的"
例如:
He is their common enemy.他是他们的共同的敌人.
This custom is very common in that area.这种风俗在那个地方很普遍.
It has become common knowledge.这已经是众所周知的了.
提示:common也可作"普通的"讲,这时可以同ordinary 换用,"普通人"也可以说成common people
average
意为"平均的""中等的,普通的,平常的"
例如:
the average age 平均年龄
an article of average quality 质量一般的货品