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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 容易
  • 浏览 425

The workers ___ busily when the boss came to look for something she ___ in the office.

A.had worked; had left B.were working; had left C.working; had left D.had worked; left
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