–A boy was killed by the tiger in the zoo.–He was believed into the cage while feeding the tiger without permission.A.to fallB.to be fallingC.to have fallenD.having fallen
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C解析这题考查句型;Sb、sth is believed to have done“某人，某物据相信已经做了”，句意是：--一个男孩在动物园被老虎吃了。--据说他是未经允许喂老虎时掉入笼子的。因为这件事已经发生，所以用不定式的完成式。选C。