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为什么I came to China for the second time this spring 的句子中用this

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为什么I came to China for the second time this spring 的句子中用this spring ,而不用in this spring
RT.
为什么I came to China for the second time this spring 的句子中用this
在英语中有些词语前是不加介词的,具体如下:
1.在 today,tomorrow,yesterday,the day before yesterday,等表示时间概念的名词前一般不用介词.例如:
1) What are you going to do tomorrow?
你们明天打算干什么?
2) We have had six lessons today.我们今天上了六节课.
3) We had a good time the day before yesterday.我们前天玩的很开心.
2.由this,that ,these,those 等用于表示时间概念的名词前,前面往往不加介词.例如:
1) That morning he got up very early.那天早上他起得很早.
2) What are you busy with these days?这几天你在忙些什么?
3) We will have a big gathering this coming Saturday.下星期六我们将进行一次大聚会.
3.由next,last,the next,the last 等用于表示时间概念的名词前时,前面不用介词修饰.例如:
1) We planted many trees last spring.
去年春天我们栽了许多树.
2) She said she would pay a trip to Suzhou the next month.
他说他下个月将去苏州.
3) The very next time I saw her,she was working in London.
在那次之后我又见到他时,他正在伦敦工作.
4.在each,any,every,some,all 等用于表示时间概念的名词前,一般不用介词来修饰.例如:
1) The buses go every 10 minutes.汽车每隔10分钟一辆.
2) Jack coughed all night.杰克咳了一整夜.
3) We have to get up very early every day.每天我们都必须早早起来.