All the preparations for the task , and we’re ready to start. A. completeB. have completed

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A. plete
B. have pleted
C. had been pleted
(答案→)D. have been pleted
解析：句意：所有的任务的准备工作都完成了，我们准备开始了。从we’re ready to start.可知现在准备开始，那么准备是已经完成，而且preparations和plete是被动关系，所以用现在分词的被动，所以选D。