All the preparations for the task and we're ready to start.A. completedB. completeC. had

问题补充：

All the preparations for the task ，and we e ready to start.

A. completed

B. complete

C. had been completed

D. have been completed

答案：

A. completed

B. complete

C. had been completed

(答案→)D. have been completed

解析：

现在完成时表示过去做的事对现在的影响。从and we e ready to start句意可知，一切准备工作已经就续，可以开始工作了。complete是及物动词，与句子的主语是被动关系，所以需要用被动语态表达。