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  • 科目:英语
  • 题型:单选题
  • 难度:容易
  • 人气:1175

You never know how much difficulty we had ______the problem. Luckily, we managed to solve it with Mrs Wu’s help.

A.working out B.work out
C.worked out D.to work out
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Youneverknowhowmuchdifficultyw