◎ 题干
—Do you know _____ Tom's sister is a doctor or not?      
—No, I don't know.       
[     ]
A. that      
B. whether      
C. where      
D. what
◎ 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“—Do you know _____ Tom's sister is a doctor or not?—No, I don't know.[ ]A. that B. whether C. where D. what…”主要考查了你对  【从属连词】  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。