公共英语一级
A.playing
B.to play
C.played
【知识扩展】watch sb.do sth.和watch sb.doing sth.的区别:watch sb.do sth.表示看到某人在做某事,强调经常性的动作,多用于经常性的事情或动作;watch sb.doing sth.表示看到某人正在做某事,强调正在进行的动作。
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A.pay
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