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．a(chǎn)re 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．a(chǎn)re working D．had been working

查看答案和解析>>

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