Jackhasn'tfinished________hishomewo

发布时间：2020-07-27 03:36:36

Jack hasn't finished ________ his homework．But now he is busy ________ chess on the Internet．A.doing; playingB.to do; to playC.to do; playingD.doing; to play

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A解析动词finish及结构be busy后都应跟动词-ing形式，不能跟动词不定式。
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