◎ 题干
—How long _____ you _____ the library book?
—For three days.

A. have; borrowed
B. have; kept
C. did; borrow
D. were; kept
◎ 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“—How long _____ you _____ the library book? —For three days. [ ]A. have; borrowed B. have; kept C. did; borrow D. were; kept …”主要考查了你对  【实义动词的过去分词】【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。