◎ 题干
— Is there any better way to help my son get rid of the habit of playing computer games?
— To tell you the truth, it's very hard. But we      on this problem to improve the situation.
[      ]
A. were working
B. had worked
C. are working
D. had been working
◎ 答案
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◎ 解析
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◎ 知识点
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