【题目】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
在线课程【答案】D
【解析】句意：是在他在中学的2013年这个男孩成为电脑方面的专家吗？这里使用强调句的一般疑问句，结构是Is/was+it+强调部分+that+其余部分，这里强调的是in 2013, when he was still at a middle school，其中有个定语从句。所以选D。