They believe a single gunman carried out the attack. A. The attack’s is believed to have carried out a single gunman B. A single gunman is believed to have carried out the attack C. It is

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They believe a single gunman carried out the attack.

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

Đáp án B

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