◎ 题干
The students have cleaned the classroom, _____?
[     ]
A. so they      
B. don't they    
C. have they    
D. haven't they
◎ 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“The students have cleaned the classroom,_____?[ ]A. so theyB. don’t they C. have they D. haven’t they…”主要考查了你对  【现在完成时】【反意疑问句】  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。