The research is so designed that once ____ nothing can be done to change it. A．
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
| 此题也为省略句。连词once后省略了主语the search，从句“once begun”相当于“once the search is begun”。答案为D。 |
举一反三
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