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  • 更新 2022-09-04
  • 科目 英语
  • 题型 选择题
  • 难度 中等
  • 浏览 20

A landmark(里程碑) in the history of science was made by a photo _______ was taken on April 10th about the black hole in a faraway galaxy(星系).(  )

A.

who

B.

which

C.

what

D.

when

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Alandmark(里程碑)inthehistoryofsc