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 [解析] once begun在句子中作状语.begin可以作及物动词.意思是“着手 .译文:这项研究设计得那么好.一旦着手研究.就没有什么地方要更改的了.答案为D.
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The research is so designed that once _______ nothing can be done to change it.
A. begins B. having begun
C. beginning D. begun
查看习题详情和答案>>The research is so designed that once ____ nothing can be done to change it.
A. begins B. having begun C. beginning D. begun
查看习题详情和答案>>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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