All the tasks( )ahead of time, they decided to go on holiday for a week.
考试：
科目：（在线考试）
问题：
A：had been fulfilled
B：having been fulfilled
C：were fulfilled
D：been fulfilled
答案：
解析：
【解析】分析句子可知，这号之后是个句子，故逗号之前不能为句子，A和C项均是谓语动词形式，故排除；D项属于be fulfilled用于完成时的部分谓语表达，不能单独存在，故也排除，综上，本题答案选B。B项在语义上相当于一个原因状语从句：As all the tasks had been fulfilled ahead of time...。
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All the tasks( )ahead of time, they decided to go on holiday for a week.
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