They believe a single gunman carried out the attack.

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Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions.

The attack’s is believed to have carried out a single gunman

A single gunman is believed to have carried out the attack

It is believed to be carried out the attack by a single gunman.

It is believed that the attack has been carried out by a single gunman.

Giải thích

Câu bị động có động từ tường thuật

Active: S1 + V1( hiện tại) + that + S2 + V2( quá khứ)+ O + ….

Passive:C1: It is + PP.2 của V1 + that + S2 + V-ed + O + …..

C2: S2 + am/is/are + PP.2 của V1 + to + have + PP.2 của V2 + O + ….

Đáp án B