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-Is there any possible way to help them get rid of such a bad habit?-To tell the

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-Is there any possible way to help them get rid of such a bad habit?-To tell the

—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

试题答案

C

解析试题

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