问题补充：
The child, who was believed by a tiger, was found in a forest.
A. to be killed
B. having killed
C. to have been killed
D. to be killing
答案：
A. to be killed
B. having killed
(答案→)C. to have been killed
D. to be killing
解析：考查非谓语动词。“sb. /sth. +be+believed+to do”表示“某人/某物被认为??”，动词不定式用一般式，表示其动作发生在谓语动作之后，如若用完成式，则表示发生在谓语动作之前，若用动词不定式的被动式，则表示与句子主语之间是逻辑上的被动关系。句意：据说已经被老虎吃了的孩子，在森林里面被找到了。选C。
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