There was a time ＿＿ Tom was interested in music.A. which B. on which C. what D. when

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A. which
B. on which
C. what
(答案→)D. when
解析：从句修饰time（名词），因此是定语从句，从句主干完整，time 在从句做时间状语，使用关系副词，因此填when 或during which, B选项介词不对。