–What do you think the noise was?
--It a cat.
A. may be
B. might be
C. can have been
D. might have been
网友回答
A. may be
B. might be
C. can have been
(答案→)D. might have been
解析：考察情态动词用法。根据was可知是罪过去情况的推测。对过去情况进行推测应该使用情态动词+have done;排除AB；can have done表示对过去行为的怀疑，用于疑问句，译成 可能做过……吗？might have done也许做了；句意：—你认为那个噪音是什么？—也许是一只猫吧！