问题标题：
【Atrafficaccident______(happen)ontheroad应该填washappened还是填hashappened?能否填hashappened?】
问题描述：
Atrafficaccident______(happen)ontheroad
应该填washappened还是填hashappened?
能否填hashappened?
陈辉焱回答：
应该是hashappened
washappened是被发生
hashappened是已经发生
washappened是被动语态
washappen才是过去式
hashappened是完成时
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