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To tell you the truth, it's very hard for us to help them get rid of Internet addiction But we ________ on this problem trying to improve the situation
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To tell you the truth, it's very hard for us to help them get rid of Internet addiction But we ________ on this problem trying to improve the situation
A、 worked
B、 had worked
C、 are working
D、 ha been working
时间：2021-07-17 22:56
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答案解析
C
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