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All the preparations for the task ________, and we're ready to start.
A.completedB.have completed
C.will be completedD.have been completed
D
D 考察动词时态。句意:这项任务的所有准备工作都已经完成,我们准备开始了。意为准备工作是否完成影响到我们现在是否能够开始,所以此处表示过去已经发生的动作对现在产生的影响,使用现在完成时。而准备工作和完成构成被动关系,所以使用完成时的被动语态。故D正确。
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