much提前引导让步状语从句,后面填上as补充完整,整句为：
Much as he claims he has a good taste of his own,he can't avoid being influenced by advertisement.
尽管他总是声称自己拥有良好品味,但也未能避免受到广告的影响.
这里much修饰动词claim,表示程度,就是“经常声称”,这句话的标准语序为：
As he claims much he has a good taste of his own,he can't avoid being influenced by advertisement.
将状语提前构成倒装句在英语中是为了表强调,突出他声称的次数虽多,其实也受到广告影响.