Was it in 1998, when he was still at middle school, ______ this boy became a

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Was it in 1998, when he was still at middle school, ______ this boy became an expert at computer?
A. which B. where C. that D. when

选C,强调句的疑问形式。

when he was still at middle school是定语从句,修饰1998

原句可以看成 Was it in 1998 (that) this boy became an expert at computer?

陈述句为It was in 1998 (that) this boy became an expert at computer

C

C that
这是it was ...that形式的强调句的疑问句
when。。。只是一个定语从句,用来修饰时间
做此类题,先把疑问句改成称述句,再按照陈述句的做法做即可,注意固定句式