We really enjoyed our trip in Beijing last month, ___ we did some shopping and tasted some local food.
A, when
B, where
答案是A。
1：B也可以吧？
2：请问这句话的先行词是our trip? 北京？还是last month?
We really enjoyed our trip in Beijing last month, ___ we did some shopping and tasted some local food.
先看看假如用并列句，会是什么句子：
We really enjoyed our trip in Beijing last month, and during the trip we did some shopping and tasted some local food. 或者：
We really enjoyed our trip in Beijing last month, and during that time we did some shopping and tasted some local food.
that time为前一分句谓语动作发生的时间。during that time 意为在谓语动作发生的那段时间里。
并列句改为主从复合句，则仅需删去并列连词and, 然后用关系代词替换the trip, 或用关系限定词which取代指示限定词that即可：
We really enjoyed our trip in Beijing last month, during which we did some shopping and tasted some local food.
We really enjoyed our trip in Beijing last month, during which time we did some shopping and tasted some local food.
或者用关系副词替换during which 或 during which time, 得到：
We really enjoyed our trip in Beijing last month, when we did some shopping and tasted some local food.
所以，这个句子用when引导定语从句，先行词为our trip in Beijing。
