People of different countries and regions, different nationalities and cultures have formed with solidarity an Olympic family, ______they have deepened understanding and enhanced friendship
A.when
B.which
C.that
D.in which
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D解析考查定语从句。句意“不同国家和地区的人，不同国籍和文化，以团结组成奥运大家庭，在那里，他们加深了理解，增进了友谊。”根据逗号可知，是非限制性定语从句，排除that；从句不缺少成分，排除B；逻辑主语是family，指地点，故用in which。故选D。