独立主格结构的题2、They--------,the meeting was held according to scheduleA、having all arrived B、arrivingC、all arrived D、have all arrived3.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
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.
选A All the task having been fulfilled ahead of time(提前完成了), 为从句 。。。。。。。。。they decided to go on holiday for a week.为主句 。。。。。从句的动作发生在主句之前。。也就是说符合(过去的过去规则)。所以从句必需用完成时态