he is not an america,_____he has never been to america.这句话的联词,用and 还是or 为什么?

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• he is not an america,_____he has never been to america.这句话的联词,用and 还是or 为什么?
• was done和had been done的区别今天学习新二第34课.主要讲的被动语态的过去式和过去完成时的被动语态.前面的比如he has been worried.he was wanted by the police.这些我都能弄懂.但是后面他这讲他单车这里我没弄明白.his bicycle had been found这句话.为什么要用过去完成?如果用his bicycle was been found不就行了吗?是不是因为找到这辆单车在警官和他说话之前.所以是过去的过去,用过去完成?请老师详解,别忽悠.
• When Mark opened the door ,he saw a woman standing there.He____he beforeA has never seen B had never seen为什么B不可以啊 不是前面有个saw么,然后see这个动作是发生在saw之前啊.
• He has been to America.对America提问. __ __ __ he been __?