TV-Turnoff Week, millions of people around the world participate every year, tries to encourage people to turn on life.
A. in which
B. on which
C. which
D. when
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(答案→)A. in which
B. on which
C. which
D. when
解析：这题考查定语从句，先行词是TV-Turnoff Week，定语从句中缺少时间状语，句意是：全世界很多人参与的远离电视周是想鼓励人们转向生活。选A。