All the investigations ______ before the deadline, the staff decided to have a party as a celebration.

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问题 All the investigations ______ before the deadline, the staff decided to have a party as a celebration.

选项 A、been fulfilled
B、had been fulfilled
C、were fulfilled
D、having been fulfilled

答案D

解析 独立结构。“名词/代词+ing分词/过去分词/不定式”是独立结构,一般可以置于句首(也可以置于句末),表示原因、时间、条件、方式或伴随情况。选项B 和C 不符合语法规则,没有连词连接的两个独立的句子不能并置。由句意判断,这里应选现在分词的完成被动形式,应选D 。
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