◎ 题干
—What's wrong with your uncle, Mary?
—He's ill. A doctor _     .          
[     ]
A. has to look for
B. is being operated on
C. has been sent for
◎ 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“—What's wrong with your uncle, Mary? —He's ill. A doctor _ . [ ]A. has to look for B. is being operated on C. has been sent for…”主要考查了你对  【被动语态】【现在完成时】  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。