All the preparations for the task ______, and we're ready to start.
A．completedB．completeC．hadbeencompletedD．havebeencompleted
D
現(xiàn)在完成時表示過去的動作對現(xiàn)在造成的影響。從and we're ready to start 可知，一切準備工作已經(jīng)就緒，可以開始工作了。
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