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
网友回答
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。