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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 容易
  • 浏览 1222

_______  a cold morning, I opened the window and was glad to find that It was snowing
outside.

A.By B. In C.At D.On
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acoldmorning,Iopenedthewindowa