The policeman, . . . . . . . . caught the thief, is a very brave man. A. whom B. whose C. which D. who

The correct answer is D. who.

The sentence is about the policeman, and we are trying to identify the policeman. The policeman is the subject of the sentence, and the verb is “caught.” The pronoun “who” is used to refer to the subject of a sentence.

A. whom

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