题目

--Do you know when the Chinese custom_________ from? --It's hard to say. But its characteristics__________ the Tang Period. A. began ; prove                 B. started ; show C. is ; appear                   D. dates ; suggest 答案：D 解析: 本题关键是抓住答句中所提供的信息，“It's hard to say'’，这表明回答者并不很肯定。而prove证明，show表明，排除A，B。前一空date from意为“追溯至……”

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