语法大全补充250题—186题！谢谢~

186.       The utility company has announced that it will permanently close its Unit I nuclear power plant, the first plant that had been built by private industry and the model for a generation of modern nuclear reactors.

(A) that had been built by private industry and

(B) built by private industry and which was

(C) to be built by private industry and which was

(D) built by private industry and

(E) to have been built by private industry and was

答案：D 

为什么A不对？ 句首“company”使用的“has”—现在完成时，而划线部分“first plant”肯定实在company说话之前建造”been built“的啊，那用过去完成时有什么不对么？

逗号后面做its Unit I nuclear power plant的同位语，时态跟 it will 配合