Peter, David and Paul said following sentences: Peter: David is a liar, Paul always tells the truth. David: Peter is truthful. P

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问题 Peter, David and Paul said following sentences: Peter: David is a liar, Paul always tells the truth. David: Peter is truthful. Paul: David is a liar, Peter is truthful. Two of these men always tell the truth, one of them sometimes tells the truth and sometimes lies. Which of these men is a liar?

选项 A、Peter
B、David
C、Paul
D、Not sure

答案B

解析
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