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  • 科目:英语
  • 题型:单选题
  • 难度:较易
  • 人气:1630

—Is there any possible way to help them get rid of such a bad habit?
—To tell the truth, it’s very hard. But we ________ on this problem, trying to improve the situation .

A.worked B.had worked C.are working D.had been working
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—Isthereanypossiblewaytohelpth