英语单项选择问题.6.A number of paintings in the castle are believed（

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英语单项选择问题.
6.A number of paintings in the castle are believed（） in a fire.
A.being destroyed B.having been destroyed
C.to be destroyed D.to having been destroyed
此题选D,求详细分析,

sb/sth be believed to do sth .排除A,B两项.C,D两项都是被动语态,但D项表示完成因为大量的画作被毁坏这个动作发生在被认为（被人认为）这个动作之前,故用完成时态.又看了其他网友的回答,do 是指动词的原形形式,D项应是To have been done,没有To having been done 的结构,你可以到有道词典里去搜,我搜了一下,搜不到.这题的正确答案是To have been done.

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