[求助]LSAT题目中的逻辑关系

floractc

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) N 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.

My understanding: A--->senator; B--->spoke at the convention; C---a Democrat, so reasoning will be:

A&B--->C, not C---> A&B, how is possible? Thanks in advance~

lawyer_1

原文第一句话的意思是：如果A,B有交集，则这个交集一定是C。第二句话的意思是：这个交集不存在。也就是A,B没有交集。就是答案D

flora_1652

果然厉害,这么一说我就明白了,谢谢版主~~最近逻辑陷入瓶颈,努力突破中...

happywawa

领教

heartnocturn

这个算是很直接的逻辑题了吧