The research is so designed that once nothing can be done to change it. A. begins B. ——青夏教育精英家教网—

摘要： 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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The research is so designed that once ____ nothing can be done to change it. (NMET2002)

A. begins B. having begun C. beginning D. begun

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