(单选题) 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

(单选题) 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

出自：西安石油大学大学英语（2）作业题

提示：
每天可免费获取10次答案

收藏本站【zk.995w.com】，下次访问不迷路

本站试题总数:【10253414】个 (题库试题定时更新)