–A boy was killed by the tiger in the zoo.
–He was believed into the cage while feeding the tiger without permission.
A. to fall
B. to be falling
C. to have fallen
D. having fallen
网友回答
A. to fall
B. to be falling
(答案→)C. to have fallen
D. having fallen
解析：考察固定结构。Sb be believed to do sth某人被认为做某事；本题应该使用完成式，表示在谓语动词之前已经完成的动作。故C正确。