问题
选择题
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
答案
答案：C
考察独立主格结构。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.