To tell you the truth, it.s very hard for us to help them get rid of Internet addiction. But we _________ on this problem trying to improve the situation. （4.0分） 4.0 分 A、 had worked B、 are working C、 had been working D、 worked

To tell you the truth, it.s very hard for us to help them get rid of Internet addiction. But we _________ on this problem trying to improve the situation.
（4.0分）
4.0 分

A、

had worked
B、

are working
C、

had been working
D、

worked

出自：郑州航空工业管理学院-大学英语

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