845. 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

Solution:

Tenses

In A, use of past perfect tense “had been” is wrong.
In B and C, it is suggested that “the first plant” is no longer “the model”, which is not the intended meaning.
In E, present perfect continuous tense used is wrong. It illogically suggests that the private industry started building the plant in the past and is still building it.
In D, “built by private industry” correctly modifies the “Unit I nuclear power plant” in simple past and hence, D is the best choice.

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