York，________ last year，is a nice old city．
A.that I visitedB.which I visitedC.where I visitedD.in which I visited在线课程B
解析：
该题考查非限制性定语从句.visit是及物动词，后面需要关系代词作宾语，排除C、D；
that 不用于非限制性定语从句，排除A.B是最佳选项.例如：I gave her an interesting book，which she started to read at once．我给了她一本有趣的书，她马上就读了起来.The clock，which my great-grandfather bought，is still in good order．这时钟是我曾祖父买的，现在还走得很准.