独立主格结构的题2、They--------,the meeting was held according to schedule_英语解答

独立主格结构的题
2、They--------,the meeting was held according to schedule
A、having all arrived B、arriving
C、all arrived D、have all arrived
3.All the task having been fulfilled ahead of time（提前完成了）,they decided to go on holiday for a week.
为什么用having

人气：119 ℃　时间：2020-09-18 23:05:37

解答

having （been）done 表示在主句谓语动词之前已经（被）完成的动作
第二题中,人先到的,会议后召开的；
第三题中,先提前完成任务,后决定去度假.had been done 呢had been done是谓语动词的过去完成时啊，与非谓语动词无关，表示在过去的某个动作或时间点之前已经完成的动作。