let'a talk all this over again______we make a final decision

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let'a talk all this over again______we make a final decision.（状语从句）
A,after B.before C.while D.as
选项A错哪了?反复的谈论之后我们做出最终的决定.意思说的过去啊,但为啥错了呢
应该选择哪个?麻烦解释下

选B
意为：在我们做出最终决定前,让我们再次讨论一下这个问题吧.
这道题关键在 Let`s 这个词上,Let`s 引导的是祈使句,一般是在对话中使用的,而不是书面用的陈述句.你想像一下这句对话发生的场景：你和你的小伙伴在讨论去哪玩,有了个初步方案,你对你的小伙伴说“我们再讨论讨论吧,别急着做决定“,这就是祈使句.
另外一方面,如果要用after,那从句里面应该使用完成时态,let`s talk all this over again after we have made a final decision.（”我们已经做出最终决定了,让我们再讨论讨论吧“）,这样的句子虽然语法正确,但在意思上就不合适了.
如果你还不懂什么是完成时态,那就主要从句子的意思上理解吧.

I'm sorry ,but it's over my power to make a final decision o let'a talk all this over again-----it belonged to him ,the final decision to make changes to a disturbing situatio make a decision we won't want to make the final decision unless most of us a make a final decision 做出一个最后的决定求造句! I am sorry it's beyond my power to make a final decision on 英语选择题：I am sorry it's__my power to make a final decision on have a decision还是make a decision? I _______ (make a decision) to study hard this semester. make a decision do还是make a decision to do this is my final decision