大学英语的单选题请教6.Once the decision ___ ,the most important thing

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大学英语的单选题请教
6.Once the decision ___ ,the most important thing to do is how to carry it out.
a.has been made
b.made
c.been made
d.having been made
麻烦说出理由,谢谢!

这个题目应该选B.考查的是非谓语动词.
A选项的时态是不对的,
应该是Once the decision is made,不能说“一旦这个决定已经被做出”,所以完成时是不对的.
Once the decision is made可以变成Once the decison made.非谓语动词作状语.这里的mede 是过去分词,表示被动.

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