Working hours ithe United States ____ over the past 20 years. ( )<br>·were increasing<br>·have beeincreased<br>·have increased<br>·increased

Working hours ithe United States ____ over the past 20 years. ( )
·were increasing
·have beeincreased
·have increased
·increased

出自：华北水利水电大学英语

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