The research is so designed that once ____ nothingcan be don

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The research is so designed that once ____ nothingcan be done to change it.
A.begins B.havingbegun C.beginning D.begun
要怎么选

这是2002年的一道高考题
答案是D
once后省略了it（指前面刚被提及的the research） is,下划线表示一个“（研究）被开始、被启动”的被动的动作,应该采用过去分词的形式,因此本题选D.注意：本题题干中省略的it/the research is是顺承上文而自然进行的省略,被省略后仍可以很清楚地把握,而且使得整个句子更为简练.

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