He ________ his leg when he ________ in a football match against another school．
A.broke; playedB.were breaking; was playingC.broke; was playingD.was breaking; played在线课程C
broke用一般过去时表示过去某一时刻曾经发生的动作，在有when引导的表示过去的时间状语从句中，持续时间长的动作一般用过去进行时。这里表示“在踢球时”摔坏了腿，所以后一空应用过去进行时。