◎ 题干
My mother is ill. The doctor said that she had to  _____ at once.      
[     ]
A. operate          
B. be operated
C. operate on        
D. be operated on
◎ 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“My mother is ill. The doctor said that she had to_____ at once.[ ]A. operate B. be operatedC. operate on D. be operated on…”主要考查了你对  【被动语态】  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。