摘要：13．The origin of Chinese culture more than 5,000 years ago. A．is dated back to B．dates back to C．is dated from D．dates back 答案与解析:B more than 5,000 years ago是时间点而不是时间段.故排除D项.date back to还可以用date from来表示.它们都无进行时态和被动语态.故选B项.

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