About the sixth century A. D. when few Europeans could read, the Chinese ____paper. (2 分)

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• About the sixth century A. D. when few Europeans could read, the Chinese ____paper. (2 分) A. invented B. had invented C. have invented D. had been invented.
• About the sixth century A.D.when few Europeans could read,the Chinese had invented paper.这句话后面是主句我知道,但是前面的关系我有点搞不懂 About the sixth century A.D.是时间状语?when few Europeans could read不是也是么 那两个时间状语直接连起来怎么那么别扭
• About the sixth century A. D. when few Europeans could read, the Chinese ____paper. (2 分)
• About the sixth century A.D.when few Europeans could read,the Chinese had invented paper.
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