The research is so designed that once ___ nothing can be done to change it.A.begins B.having begun C.beginning D.begun(答案是D,为什么?)

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The research is so designed that once ___ nothing can be done to change it.A.begins B.having begun C.beginning D.begun(答案是D,为什么?)

The research is so designed that once ___ nothing can be done to change it.A.begins B.having begun C.beginning D.begun(答案是D,为什么?)
The research is so designed that once ___ nothing can be done to change it.
A.begins B.having begun C.beginning D.begun
(答案是D,为什么?)

The research is so designed that once ___ nothing can be done to change it.A.begins B.having begun C.beginning D.begun(答案是D,为什么?)
这是once后省略it is的条件状语从句,nothing和begin在逻辑上是动宾关系

一旦已经开始就无法改变，排除AC,BEGIN 不是持续动词，不用HAVE BEEN 格式，排除B

分析语义是这个研究设计得太完整了一旦开始就无法改变了。
主语是The research和begin的关系是被动，一但被开始，选D

我记得好象once是搭配过去式和完成式的，所以只能在B和D里选，后面有can be done，说明不是完成时，更不是完成进行时，所以只能选D。

句子是so that类型，太…以至于的意思
begun在这里是pp,过去分成做形容词表示状态，你也可以说成it is so designed that once it begins nothing can be done
你可能是把that理解成定语从句了

D 没错。
这里是考-ed分词的用法。-ed分词本身有被动的意思。这里主语是The research ，不能发出begin这个动作，那就是被发出，可前面已经有is 做系表结构了。所以这里要找个-ed分词表被动。
希望能帮到你。

如题。 语法？？不可能阿 只有完形 天空

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