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单选题
48.The studentshomework busily when Miss Brown went back to get the book shein theclassroom.
A
A. had written； left
B
B. were writing； has left
C
C. had written ； had left
D
D. were writing； had left
答案解析
正确答案：D
解析：
48.【翻译】当布朗小姐回去取她落在教室里的书时，学生们正忙着写作业【精析】D 本句包含一个when引导的时间状语从句，根据句意和从句中的went可知,此处表示在从句动作发生时 主句动作正在进行，所以主句应用过去进行时，即主句谓语动词应用-was/were +现在分词”的形式：另外，分析句子 结构可知，book后面是一个省略了引导词的定语从句,leave所表示的动作发生在went back to get表示的动作之前， 即发生在“过去的过去”，所以定语从句应用过去完成时,即谓语动词用“had +过去分词”的形式，故选I）
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