In the sentence "All the tasks having been fulfilled ahead of time they decided to go on

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In the sentence "All the tasks having been fulfilled ahead of time, they decided to go on holiday for a week", the italicized phrase is _____.

A.an independent genitive construction

B.a preposition-predicate construction

C.a predict-object construction

D.a subject-predicate construction

请帮忙给出正确答案和分析,谢谢!

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