Was it in 2013, when he was still at a middle school, ________ this boy became an expert at the comp...
2022-10-26 08:31:54 168次 2016届重庆市高一下学期期末考试英语试卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
Was it in 2013, when he was still at a middle school, ________ this boy became an expert at the computer?
A. which B. when C. where D. that
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