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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 较易
  • 浏览 663

To their disappointment, they found the lecture given by the professor difficult__________.

A.to be understood B.to understand
C.understanding D.understood
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相关知识点

Totheirdisappointment,theyfoun