it must be 2 boys___chess A play B playing Cto play Dare playing

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it must be 2 boys___chess A play B playing Cto play Dare playing

it must be 2 boys___chess A play B playing Cto play Dare playing
it must be 2 boys___chess A play B playing Cto play Dare playing

it must be 2 boys___chess A play B playing Cto play Dare playing
B 句子已有谓语must be ,排除A ,D,所以应选非谓语,该句是猜男孩正在干什么,所以用playing