玩下逻辑你要多久做出来

werkingwolf

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?
(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.（D）
(E) Some Democrat senators spoke at the convention.

werkingwolf

做完汇报一下时间再来下一题