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    精英家教网 > 高中英语 > 题目详情

    ——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.
    A．workedB．had workedC．are workingD．had been working
    C
    考查时态。“有帮助他们改掉这种坏习惯的可行的方法吗？”“说实话，非常难。但是我们还正在研究这个问题。”根据句意可知，用现在进行时。故选C。
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