Not until the 11th century, when a young lady brought a fork to Italy, .A. and the custom

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A. and the custom reached Europe.
B. that the custom reached Europe.
(答案→)C. did the custom reach Europe.
D. so did the custom reach Europe.
解析：句意：直到11世纪，一个妇女把叉子带到意大利，使用刀叉的风俗才到了欧洲。
这是一个将时间状语 not until the 11th century 提到句首的句型，句子要倒装。When引导的从句是作11世纪的定语从句，所以要选择一个倒装的句子。故选C。