题目内容

All the preparations for the task ______, and we're ready to start.
A．completedB．completeC．hadbeencompletedD．havebeencompleted
D
现在完成时表示过去的动作对现在造成的影响。从and we're ready to start 可知，一切准备工作已经就绪，可以开始工作了。
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