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  • 科目:英语
  • 题型:单选题
  • 难度:较难
  • 人气:1087

In order to finish the experiment successfully, the professor always _________, for every day the light in his room didn’t go out until 4 a.m.

A.mixed up B.cleaned up C.turned up D.stayed up
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Inordertofinishtheexperimentsu