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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 较易
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— Did he realize the serious situation immediately?
— No. It was quite a long time ________ he really realized it.

A.now that B.when C.ever since D.before
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—Didherealizetheserioussituati