The students ＿＿＿＿＿ busily when Miss Brown went to get a book she ＿＿＿＿＿ in the office._大学英语语法_远程教育查题网

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题目：The students ＿＿＿＿＿ busily when Miss Brown went to get a book she ＿＿＿＿＿ in the office.
- A. were writing ; had left
- B. were writing ; has left
- C. had written ; had left
- D. had written
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