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

答案B

解析 本题考查独立主格结构。分析句子可知,the staff decided to have a party是句子的主干,逗号前的部分不是一个完整的句子。“名词/代词+现在分词/过去分词/不定式”是独立结构,表示原因、时间、条件、方式或伴随等,故答案为[B]项。
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