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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 308

When he was opening the door, he was ___________ that he was being followed by a policeman.

A.conscious B.casual C.careful D.doubtful
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Whenhewasopeningthedoor,hewast