A boy ,together with his friend,______(wait) for three hours there.RT【要有理由】

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A boy ,together with his friend,______(wait) for three hours there.RT【要有理由】
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A boy ,together with his friend,______(wait) for three hours there.RT【要有理由】
A boy ,together with his friend,______(wait) for three hours there.
RT
【要有理由】

A boy ,together with his friend,______(wait) for three hours there.RT【要有理由】
is waiting
主语是单数

has been waiting
,together with his friend,是插入语,不用看,所以用单三,已经在这等了3个小时了,并且还未结束,所以用现在完成进行时

has been waitted

has been waiting
因为动作已经开始而且未结束
而且是单三