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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1913

—Why,I didn’t get you on the phone.
—We ________football on the playground when you phoned.

A.must be playing
B.must play
C.must have played
D.must have been playing
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相关知识点

—Why,Ididn’tgetyouonthephone.—