◎ 题干
The students ______ busily when Miss Brown went to get a book she ______ in the office.
[     ]
A. had written; left
B. were writing; has left
C. had written; had left
D. were writing; had left
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“The students ______ busily when Miss Brown went to get a book she ______ in the office.[ ]A. had written; left B. were writing; has leftC. had written; ha…”主要考查了你对  【过去进行时】【过去完成时】  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。