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The weather in Beijing is different from that in London.

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The weather in Beijing is different from that in London.
为什么句中的that不能用it代替?
The weather in Beijing is different from that in London.
it,one 和 that一向是一个备考的热点问题,前些年的试卷中经常出现,不过现在好像很少见到了.
it,只能是特指上文已经提到过的事物,或是双方都清楚的事物.如 Look at that car,I bought it last week.
它还有许多其他的用法,如表示说话人所指的某一种形势或情况.
If a fire breaks out in this market,it may cause a lot of deaths.
或是说话人所指的某一种情况如,I hate it when people talk with their mouthes full.
它还可以用来表示身份或性别不详之人,如 Somebody's knocking at the door.Who might be it?
它还可以用作形式宾语和形式主语,还可以用在it is .that/who句型中表示强调,还可以用来表示天气、距离等.
one的意思为某一个,多指与上文所提事物同一种类的不确定的某一个.
I lost my pen,can you lend me one?
There are two apples in the basket.One is green,while the other one is red.
that多指上文所提事物的同类,但是这些事物大多是一些抽象的概念.注意这里的that并不是特指哦.
如您的题目中那个that实际上指的是伦敦的天气,和上文中北京的天气属同一类别.还有一个经典的例句:
The population of China is larger than that of Japan.