the operation lasted for over four hours.that's how long it-

手术持续了四个多小时.
that's how long it 它持续了多长啊
选择2 went on 持续；继续前进
went out v.熄灭,过时；离开
went into 从事,参加
went up 上升；被建立（go up的过去分词）
went back 走下坡
went through 经历；穿过；审查
went down 下跌,下来；蹲下
went home 回家；击中要害
went in 进入；参加；被云掩盖
went away 离开
went by 时间逝去；从……旁走过
went for v.攻击；尽力想求得
went off 爆炸,离去
went over 越过；检查
went to bed 上床睡觉
went with 陪伴；带有；配合
went abroad 出国
went wrong 弄错；走错路；出毛病
went along 前进,继续
went around 走来走去