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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 较易
  • 浏览 1843

The chemistry teacher required the students _______ more attention _______ the lab clean.

A.to pay, to keep B.to paying, to keeping C.to pay, to keeping D.paying, keeping
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Thechemistryteacherrequiredthe