---I went to see you this morning, but you weren’t in．---I ______ my homework and I ______ a football match in the stadium then．A.did; was watchingB.had done; was watchingC.was doing; was watchingD.had done; had watched
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B解析根据上下文语境：当你找我时，我刚作完作业(用过去完成时)正在体育场上观看足球比赛(用过去进行时)。