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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1787

— What on earth are the police busy with?
— They _____into how the plane crash came about.

A.had been looking B.were looking
C.would look D.have been looking
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—Whatoneartharethepolicebusywi