◎ 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; leftB.were writing; has leftC.had written; had…”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。