The research is so designed that once _____ nothing can be done to change it.A．b
题型：不详难度：来源：
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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答案
| D |
解析
答案选D，可视为once it is begun之省略。
【标签】省略 |
举一反三
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