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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1147

—What are you busy with recently?
—We have been looking into how the machine breakdown __________.

A.came out B.came about C.came down D.came up
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—Whatareyoubusywithrecently?—W