—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. worked
B. had worked
C. are working
D. had been working
网友回答
A. worked
B. had worked
(答案→)C. are working
D. had been working
解析：句意：--有可行的方法来改掉坏的习惯？--说句实话，很难。但是我们正在解决这个问题，试图提高现状。从第一句可以看出现在还没有改掉习惯，所以应是现在正在想法去解决，故选C。