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．a(chǎn)re workingD．had been working
C
考查動詞時態(tài)。語境意義：“這個問題還沒解決，我們正在努力解決這個問題”，因此用現(xiàn)在進行時。對動詞時態(tài)的考查歷來是高考試卷的重點內容。
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