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in which引导定语从句，修饰interview。介词+关系代词可以引导定语从句。
(1) 有时，前面的介词可移到定语从句的中间或后面，此时whom可用who, that代替；which可以用that代替。而且who, whom, which, that都可省略。如：
The man with whom you talked just now is our manager. —The man who you talked with just now is our manager. 你刚才与他谈话的那个人就是我们的经理。
He handed me a pen, with which I wrote down my address for him. —He handed me a pen, which I wrote down my address with for him. 他递给我一支钢笔，我就用那支钢笔给他写下了我的地址。
(2) 当先行词是时间、地点、原因从句时，介词+ which一般在定语从句中分别做时间、地点、原因状语，于是介词+ which可以分别用when,
where, why代替。但若介词+ which不是作时间、地点、原因状语，则不能用when, where, why代替。如：
Last week, I visited Shanghai, in which I have made several friends. —Last week, I visited Shanghai, where I have made
several friends. 上周我参观了上海，在那儿我叫上几个朋友。
I will remember the day forever on which I won the first place in the contest. —I will remember the day forever when I won the first place in the contest. 我将永远记住我在竞赛中获得第一名的那一天。
2.What seems to have angered France most is Mrs Reding’s apparent comparison between the persecution of Jews and Gypsies in Nazi-occupied France and today’s expulsions of the Roma.
What seems to have angered France most是what引导主语从句。
