every year, many people do not hold a high opinion of the CCTV Spring Festival Gala, it has bee a somewhat necessary part of the festival.
A. As
B. Therefore
C. While
D. Since
网友回答
A. As
B. Therefore
(答案→)C. While
D. Since
解析：考查状语从句。句意“尽管每年都有许多人对春晚的评价不高，但他已经在不知不觉中成为春节必不可少的一部分。”前后两分句表达的是转折含义，故用“尽管，虽然”；while有“尽管”的意思，表示让步，故选C。