71.

Answer and Explanation

Your Answer is

Correct Answer is D

Explanation

Item A/C: The subject of the sentence is Boyd and the predicate verb is used, so the underlined part cannot be the subject-predicate structure, and A/C is wrong.

Item B: The underlined part is part of the adverbial sentence, and its logical subject should be the subject of the main clause, so the judgment of item B is wrong.