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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
游客
2025-03-17
41
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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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