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The research is so designed that once nothing can be done to change it. [ ] A．be

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The research is so designed that once nothing can be done to change it. [ ] A．be

The research is so designed that once _______nothing can be done to change it.

[]

A．beginsB．having begunC．beginningD．begun

试题答案

答案：D

解析：

本题考查“连词＋分词”作状语。题干中的once是连词，表示“一旦”，begin与research具有逻辑上的动宾关系，故该用“once + begun”作状语(once begun＝once it is begun).

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