◎ 题干
This problem is said _____ three times.  
[     ]
A. to have been talked      
B. to have discussed  
C. having been discussed    
D. to have been talked about
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“This problem is said _____ three times.[ ]A. to have been talkedB. to have discussedC. having been discussed D. to have been talked about …”主要考查了你对  【不定式的完成式】【不定式的被动式】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。