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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1365

—Have you seen your friend off ?
—Yes. I watched the train leaving the station        it disappeared from sight.

A.unless B.as if C.so that D.until
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—Haveyouseenyourfriendoff?—Yes