題目列表(包括答案和解析)
The research is so designed that once _______ nothing can be done to change it.
A. begins B. having begun
C. beginning D. begun
The research is so designed that once ____ nothing can be done to change it.
A. begins B. having begun C. beginning D. begun
The research is so designed that once _______ nothing can be done to change it.
A. begins B. having begun C. beginning D. begun
The research is so designed that once _______ nothing can be done to change it.
A. begins B. having begun C. beginning D. begun
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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