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It is well knon that China is rich in natural resources As is well known , China is rich in natural resources China is rich in natural resources , that is well known |
| sure. it; as; that. |
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It; As; Which; 重点说下which，在非限制性定语从句中，宜用which指代主句，而不用that。比如 More and more people are beginning to learn English, which is becoming very popular in our country. (which指代主句) |
