◎ 题干
Tom was very glad          to attend the ceremony.
[     ]
A. being allowed      
B. to have been allowed
C. having allowed  
D. to have allowed
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“Tom was very gladto attend the ceremony. [ ]A. being allowedB. to have been allowedC. having allowed D. to have allowed…”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。