Was it in 2002 he was still at middle school the boy became expert at computer?A. that;

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A. that; where
B. when; where
C. that; when
(答案→)D. when; that
解析：考察强调句型和定语从句。本题强调的是时间状语in 2002 when he was still at middle school.其中定语从句When he was still at middle school修饰先行词2002;第二空that与it was构成强调句型的基本结构。故D正确。