2. 外语
  3. The research is so designed that once ______nothing can be done to change it.

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

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问题 The research is so designed that once ______nothing can be done to change it.
选项 A、begins
B、having begun
C、beginning
D、begun
答案D
解析 so．．．that．．．引导结果状语从句，在出at从句中，nothing can be done to change it 是主句，之前为一个once引导的条件状语从句的省略。原句为：Once it (the research) is begun nothing can be done to change it 由于once从句中it is的省略，成了once+过去分词短语作条件状语，其他几项句法不符。故选D。
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