And the boy,who could not have been more than seven or eight

And the boy,who could not have been more than seven or eight years old,replied

【但是这个不超过七八岁的小男孩作出了回复】这个句子的的主干是：and the boy replied.这个男孩做出了回复.reply是不及物动词,后面可以不接名词.中间逗号隔开的句子是who引导的宾语从句修饰主语 boy.参考下~