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Our history said that Tibet part of China for many centuries

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Our history said that Tibet part of China for many centuries. Ahad beeb Bhas been Cwas
说明理由!
Our history said that Tibet part of China for many centuries
A、had been表示过去完成时,由于for many centuries是一个持续性动作,所以要有have + been来表示,因为这里主句已经是said 表示过去,所以后面要用过去完成时,即had+been