The clock has stopped ;The clock Was stopped

The clock has stopped ;The clock Was stopped the clock has stopped! theclock was stop! 文中用的是h 英语小问题...这句话:They realized the clock has stopped after the mi 新概念第二册第九课the clock has stopped为什么不是过去完成时而是现在完成时? It was ten o'clock at night.And the last bus just stopped at It was two o'clock.A train stopped Even a stopped clock gives the right twice a day.如何理解这句话?这句话 he has died.the rain has stopped. 开机显示time-of-day clock stopped Android出错The application has stopped unexpectedly Android:the application has stopped unexpectedly The clock has not feet.