--Where's Mr Yu, do you know?--Well, it's hard to say. But I saw him ________ a football game just now.A.was watchingB.watchingC.had watchedD.watched
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B解析see sb. doing sth.表示“看见某人正在做某事”，强调动作正在进行；而see sb. do sth.表示“看见某人做过某事”，强调动作的全过程。由题意“我刚才看见他正在看足球赛”可知选B。