问题
选择题
All the task __________ ahead of time, so they decided to go on holiday for a week.
A．having finished
B．had finished
C．having been finished
D．had been finished
答案
答案：D
这题考查句式，so引导的是结果状语从句，所以前面是主句，应该填谓语动词，时间是发生在they decided to go on holiday for a week.之前，而且task和finish是被动关系，用过去完成时的被动式，选D。