◎ 题干
 Mary is always pleased __________ at the party.
[     ]
A. to invite to sing      
B. to invite singing  
C. to be invited to sing
D. to be invited singing
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“Mary is always pleased __________ at the party.[ ]A. to invite to singB. to invite singingC. to be invited to singD. to be invited singing…”主要考查了你对  【不定式的被动式】【不定式】  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。