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　　定语从句中宜用which而不宜用that 的情况:

　　①当关系代词的前面有介词时.

　　1.A zoo is a park in which many kinds of animals are kept for exhibition.

　　2.Is this the room in which Mr. White lives?

　　②在非限制性定语从句中.

　　1.Crusoe's dog, which was are now very old, became ill and died .

　　2.More and more people are beginning to learn English, which is becoming very popular in our country. (which指代主句)

　　③在一个句子中有两个定语从句，其中一个定语从句的关系代词用了that, 另一个宜用which .

　　1. Let me show you the novel，that I borrowed from the library which was newly open to us.

　　2. At the station I bought some magazines that might help me to pass the time on the train and which I could pass on to others when I finished them.

　　④当关系代词后面带有插入语时.

　　1. Here's the English grammar which, as I have told you, will help improve your English.

　　⑤先行词本身是that, 宜用which .

　　What's that which she is looking at?

　　⑥先行词是those+复数名词.

　　A shop should keep a stock of those goods which sell best.

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