(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

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