which引导是定语从句。
例句：
There was a great ball in the city, to which Karen was invited.
城里有一个盛大的舞会，珈伦收到邀请了。
To which I say: Well, obviously.
对此我说：很明显。
扩展资料
At home, he keeps some pets, to which he devotes all his spare time.
他家里养着一些宠物，他把所有的空闲时间都花在养宠物上面了。
During sleep, the number of sites to which adenosine is bound decreases.
在睡眠期间，腺苷结合的位点数量减少。
At issue is the extent to which exam results reflect a students ability.
考试成绩能在多大程度上反映学生的能力是问题的焦点。
