求高人讲解英语句子an unknown elderly woman appered in a tv advertisem

1.in which=where=in the TV advertisement
此处考查用“介词+关系代词”所引导的定语从句.关系代词which所代指的就是先行词a TV advertisement.而in which又在后面的定语从句she looked at a very small hamburger and complained中充当地点状语.
2.则定语从句的完整句子是：
She looked at a very small hamburger and complained in the TV advertisement.
翻译：在广告中,她看着一个非常小的汉堡包并且在埋怨.
3.in which是整个定语从句的两个动作的地点状语：它不但是动词complain的地点状语,而且也是looked at a very small hamburger的地点状语.