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  • 更新 2022-09-03
  • 科目 英语
  • 题型 选择题
  • 难度 中等
  • 浏览 1080

He was about to leave the office for home _______someone knocked the door and asked for some help.

A.until B.while
C.as D.when
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Hewasabouttoleavetheofficeforh