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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1072

—Can you describe _____ it happened?
  —Yes, I was riding on my bike _____ a car knocked me down from behind.

A.when; as B.how; as    C.how; when D.how; while
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—Canyoudescribeithappened?—Yes