--- 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.workedB.had workedC.are workingD.had been working
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C解析考查动词时态。语境意义：“这个问题还没解决，我们正在努力解决这个问题”，因此用现在进行时。对动词时态的考查历来是高考试卷的重点内容。