问题 更新时间2023/4/3 12:59:00 Working hours in the United States ____ over the past 20 years. ( )(本题2.5分) A、 were increasing B、 have been increased C、 have increased D、 increased 答案 登录 注册 B、 have been increased 出自：青书学堂 >> 西安石油大学大学英语（2）作业题
问题 更新时间2023/4/3 12:59:00
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问题 更新时间2023/4/3 12:59:00
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