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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

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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.workedB.had worked C.are working D.had been working

查看答案和解析>>

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