Tom came to China in 1982, by time he had learnt to speak very good Chinese. A. what ——青夏教育精英家教网—

摘要： Tom came to China in 1982, by time he had learnt to speak very good Chinese. A. what B. that C. whose D. which

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Tom came to China in 1982, by ________ time he had learnt to speak very good Chinese．