Every time Ashrita tries to break a record, he reaches a point he feels that he cannot ph

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A. when
(答案→)B. where
C. for which
D. why
解析：句意：每一次试图破纪录的时候，Ashrita都会达到一个体力不可逾越的极限点。where_ he feels that he cannot physically do any more.是定语从句修饰point ，表示在这个点上她的体力不可逾越。先行词point在定语从句中作的是地点状语，所以用关系副词where。故选B。