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Peter, whom you met in London, is nowback in Paris. å½¼å¾ç°å¨åå·´é»äºï¼ä½ å¨ä¼¦æ¦è§è¿ä»ã
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The book I got a lot of useful information from was written by a famous scientist.
The man that wrote this book is a famous scientist.
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Whois the boy with whom you were talking a moment ago?