选B 这句话简化一下就是Was it in 2002? 后面是一个时间状语从句,用when引导,表示"在那时" (when )he was still at middle school 后面一句是从句的地点状语从句,用where引导,表示"在那里" (where) the boy became expert at compute
D when;that 楼主 这是一个强调句 句子主干是 Was it in 2002 that the boy became expert at computer? 不要被school 迷糊了 when引导he was still at middle school 引导定语从句 实际上是对2002年的解释补充吧 没有也可以的 是吧 意思是 是在2002年还上...