not untill the 11th century,when a young lady brought a fork

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.
句子原来的顺序是：The custom didn't reach Europe until the 11th century when a young lady brought a fork to Italy.将 not until 提前后,主句变成：Not until the 11th century did the custom reached Europe...原句中 when a young lady brought a fork to Italy 是时间状语从句作为插入语.因此要选 C（其中 reache 应为 reach）.