the professor teaches them chemistry.He gave us a lecture yesterday改同义句

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the professor teaches them chemistry.He gave us a lecture yesterday改同义句

the professor teaches them chemistry.He gave us a lecture yesterday改同义句
the professor teaches them chemistry.He gave us a lecture yesterday改同义句

the professor teaches them chemistry.He gave us a lecture yesterday改同义句
The professor who teaches them chemistry gave us a lecture yesterday

the professor teaches them chemistry and he gave us a lecture yesterday .