The hours the children spend in their one way relationship with television people undoubtedly affect their relationships with real-life people．
A. that
B. when
C. in which
D. on which
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(答案→)A. that
B. when
C. in which
D. on which
解析：考查定语从句，先行词是the hours，定语从句中spend少宾语，用that引导定语从句，句意是：孩子们在电视上和人们单方面的关系度过的时间毋庸置疑影响他们和现实生活中的人的关系。选A。