The flu is believed ______ by viruses that like to reproducein the cells inside the human nose and throat.后面1半

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• The flu is believed ______ by viruses that like to reproducein the cells inside the human nose and throat.后面1半
• the flu is believed to be caused by viruses that like to reproduce in the cells inside the human nose and throat.
• the flu is believed to be caused by viruses that like to reproduce in the cells inside the human nose and throat.
• 7.The government killed 14,000 chickens to stop the bird flu from spreading. (保持原句意思)The government killed 14,000 chickens ____ ____ the bird flu can be stopped from spreading.
• The flu is believed ______byviruses that like to reproduce in the cells insA.causing B.being caused C.to be caused D.to have causedwhy?