◎ 题干
Helen ______ a book about China when I went to visit her last year but I haven't read it yet.
[     ]
A. has written
B. wrote
C. had written
D. was writing
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“Helen ______ a book about China when I went to visit her last year but I haven't read it yet. [ ]A. has written B. wrote C. had written D. was writing …”主要考查了你对  【过去进行时】  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。