------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_____

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问题 ------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.

选项 A、worked
B、had worked
C、are working
D、had been working

答案D

解析
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