2. 外语
  3. By the sixth century AD, when few Europeans could read, the Chinese ______ paper.

By the sixth century AD, when few Europeans could read, the Chinese ______ paper.

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问题 By the sixth century AD, 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 时态用法。句中有表示过去的时间状语“sixth century AD”，而paper在此之前就已经发明了，表示“过去的过去”应该用过去完成时。
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