No senator spoke at the convention unless he or she was a Democrat. No Democrat

游客2024-01-13 56

问题 No senator spoke at the convention unless he or she was a Democrat. No Democrat both spoke at the convention and was a senator. Which one of the following conclusions can be correctly drawn from the statements above?

选项 A、No one but senators spoke at the convention.
B、No Democrat spoke at the convention.
C、Only Democrats spoke at the convention.
D、No senator spoke at the convention.
E、Some Democrat senators spoke at the convention.

答案 D

解析本题推理为：Senator演讲→必为Democrat→不能二者兼得。作为归纳，(D)与上面的推理完全吻合。

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