【题目】 All the task ____ ahead of time, they decided to go on holiday for a week.
A.had been finished B.were finished
C.having been finished D.been finished
在线课程【答案】C
【解析】
试题分析：考查独立主格结构。本题逗号前后两部分之间没有连词，什么逗号前面的不是一个完整的句子，故AB排除。D项的结构不完整。All the task having been finished="After" all the task has been finished，故选C项。