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帮帮忙,一道英语题The students( )busily when Mr Smith went to get som

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帮帮忙,一道英语题
The students( )busily when Mr Smith went to get some paper he( )in the office.Ahad written;left B.were writing;has left C.had written;had left D.were writing;had left
帮帮忙,一道英语题The students( )busily when Mr Smith went to get som
D 句意:当史密斯先生去拿他忘在办公室里的论文时,学生们正忙于写作.因为忘在办公室这一动作发生在去拿之前,所以要用过去完成时.