All the preparations for the task ____,we were ready to star

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All the preparations for the task ____,we were ready to start
A completed
B complete
C had been completed
D have been completed 为什么选A呢?选C不行吗,直接用过去完成时?

一个句子（主句,或从句）在没连词的时候,只能有也必需有一个谓语动词.
这句话 were是谓语动词,所以complete不能是谓语动词,所以填非谓语动词
这里preparation和 complete关系是被动,用过去分词 completed
D 答案在空格后加 and也对,或者把逗号改成句号也对.

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