Our history said that Tibet part of China for many centuries. Ahad beeb Bhas been Cwas说明理由!

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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. Ahad beeb Bhas been Cwas
说明理由!

Our history said that Tibet part of China for many centuries. Ahad beeb Bhas been Cwas说明理由!
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

a. had been
"for many centuries"表明从句应该是完成时态;
主句中said说明了整句话的时态是过去时,所以从句选择过去完成时

Choose B,虽然前面是said但这是伴随着的,并不是说在历史老师说之前,不管历史老师说没说,后面的都是事实,所以选现在完成时

A 因为前面用的said 所以在此之前就已经是了 所以该是过去的过去had