To tell you the truth, it.s very hard for us to help them get rid of Internet addictioBut we ________ othis problem trying to improve the situation<br>· worked <br>· had worked <br>· are working <br>· ha beeworking

To tell you the truth, it.s very hard for us to help them get rid of Internet addictioBut we ________ othis problem trying to improve the situation
· worked
· had worked
· are working
· ha beeworking

出自：延安大学PowerPoint 图文演示技术

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