问题
选择题
Prison 'Break is the best American TV play that I these years.[ ]
A. watch
B. will watch
C. have watched
D. was watching
答案
答案：C
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Prison 'Break is the best American TV play that I these years.[ ]
A. watch
B. will watch
C. have watched
D. was watching
答案：C
其半衰期为8天。
法正确的是 
原子核中含有78个中子