He ________ his leg when he ________ a football match against another school．
A.broke; playedB.has broken; was playingC.broke; was playingD.broke; had played在线课程C
本句意为“他在与另一所学校的足球比赛中折断了腿”。应用的句型为：sth．happened when sb．was doing sth．。