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the plan—,what is to be done now is how to carry it out

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the plan—,what is to be done now is how to carry it out
A been made B had been made C having been made D having been making选什么为什么
the plan—,what is to be done now is how to carry it out
选c(应该用被动,所以不选D.)
这句话是用逗号连接的,说明这两部分是一个句子,一个句子只能有一个谓语,在这个句子中,主语是what 引导的主语从句what is to be done(将要做的事)
谓语是系动词is
表语是how to carry it out(如何实施)
以上三部分构成了一个完整的句子,所以逗号前的不能有谓语,独立主格结构,通俗地说,不能用构成一个完整的句子,它只是后面一个句子的伴随状态,补充说明.相当于加With the plan having been made,.
有问题欢迎追问.