问题
选择题
–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
答案
答案：C
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。