You can take any seat is free.A. whichB. whereC. in whichD. that

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A. which
B. where
C. in which
(答案→)D. that
解析：考查定语从句：句意：你可以做没有人做的任何座位。先行词是any seat，定语从句中缺少主语，应该用关系代词引导定语从句，因为先行词是any这个不定代词修饰的，所以只能用that引导定语从句，选D。