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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 681

A simple 45-minute operation __________ by scientists is hoped to cure blindness in six years.

A.being developed
B.developed
C.to develop
D.developing
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Asimple45minuteoperationbyscie