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一Is there any possible way to help them get rid of such a bad habit?

一To tell the truth, it’s very hard．But we     on this problem．

A.worked             B.had worked            C.are working         D.had been working

一Is there any possible way to help them get rid of such a bad habit?

一To tell the truth, it’s very hard．But we     on this problem．

A．worked  B．had worked     C．are working     D．had been working

一Is there any possible way to help them get rid of such a bad habit?
一To tell the truth, it’s very hard．But we     on this problem．