◎ 题干
— Do you know _____? 
— For two days.
[     ]
A. how long was Nancy back
B. how long Nancy was back
C. how long has Nancy been back
D. how long Nancy has been back
◎ 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 _____?— For two days. [ ]A. how long was Nancy back B. how long Nancy was back C. how long has Nancy been backD. how long Nancy has been back …”主要考查了你对  【现在完成时】【宾语从句】  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。