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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 960

He was so busy that _____ I could say hello to him he had rushed out of the room.

A.when B.before C.since D.until
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HewassobusythatIcouldsayhellot