– When did you graduate from college?– It was in 2003 you were in middle school.A. thatB.

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A. that
(答案→)B. when
C. which
D. then
解析：考查定语从句：句意：--你什么时候从高大学毕业的？--就是在你上中学的2003年。可知这是个定语从句，先行词是2003年，定语从句中缺少时间状语，用when引导定语从句。选B。