高等继续教育 / 大学英语语法
正确率：100%
题型描述: 单选题
The students ＿＿＿＿＿ busily when Miss Brown went to get a book she ＿＿＿＿＿ in the office.
A.were writing ; has left
B.had written
C.had written ; had left
D.were writing ; had left
The students ＿＿＿＿＿ busily when Miss Brown went to get a book she ＿＿＿＿＿ in the office.
A.were writing ; has left
B.had written
C.had written ; had left
D.were writing ; had left
参考答案：
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