--- 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 teachers _______on this problem.
A.are working | B.had worked | C.worked | D.had been working |
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--- 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 teachers _______on this problem.
A.are working | B.had worked | C.worked | D.had been working |