All the task ahead of time they decided to go on holiday for a week. A. had been finishe

问题补充：

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：

A. had been finished

B. were finished

(答案→)C. having been finished

D. been finished

解析：本题主要考查对句子结构的辨析。根据句子中的逗号可知，逗号前面部分不能是单独的句子，从而排除选项A. B；再根据动词的过去分词没有被动语态这一知识可知，选项D错误。