2. 外语
  3. About the sixth century A. D. when few Europeans could read, the Chinese ______ paper.

About the sixth century A. D. when few Europeans could read, the Chinese ______ paper.

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问题 About the sixth century A. D. when few Europeans could read, the Chinese ______ paper.
选项 A、invented
B、had invented
C、have invented
D、had been invented
答案B
解析 本题测试过去完成时的用法。本句强调过去的过去，又因为是主动关系，所以B是正确答案。本句的意思是：“大约在公元6世纪欧洲人几乎还不会阅读的时候，中国人已经发明了造纸术。”
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