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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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—Those scientists invented a robot to care for kids!
—It’s not surprising.They ____ wonders all the time.

A.worked B.were working C.work D.have been working
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—Thosescientistsinventedarobot