◎ 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
◎ 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“ 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 leftD.we…”主要考查了你对  【一般现在时】【将来进行时】【过去完成进行时】【过去将来时的被动语态】  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。