◎ 题干
— Li Na went out of the China Open in the first round. Why should she be defeated by such 
      an unknown player?
— Well, that's OK. She __________ enough after becoming the world champion.
[     ]
A. could not train
B. must not have trained  
C. can not train  
D. may not have trained
◎ 答案
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◎ 解析
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◎ 知识点
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