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。