The research is so designed that once _______ nothing can be

The research is so designed that once _______ nothing can be done to change it.

A．begins

B．having begun

C．beginning

D．begun

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D

“连词+分词”作状语，依然由句子主语与分词的关系来确定，主动关系用现在分词，被动关系用过去分词。the research 与 begin 是被动关系，用过去分词 begun。

1年前

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