The research is so designed that once _____ nothing can be done to change it.A．beginsB．having begunC．beginningD．begun-高中英语-n多题

◎ 题干

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

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◎ 解析

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◎ 知识点

根据n多题专家分析，试题“The research is so designed that once _____ nothing can be done to change it.A．beginsB．having begunC．beginningD．begun…”主要考查了你对【therebe句型】等知识点的理解和应用能力。关于这些知识点的“档案”，你可以点击相应的链接进行查看和学习。

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