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    精英家教网 > 高中英语 > 题目详情
    The research is so designed that once ____ nothing can be done to change it.  
    A．beginsB．having begunC．beginningD．begun
    D
    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。
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