LSAT－18－2－11

11.   The situation has gotten worse. Unless Elizabeth goes I must go. But she will not go if I stay. So we will both have to go.

What is the flaw in the reasoning above?

(A) The first claim, that the situation has gotten worse, is irrelevant.

(B) A possible course of action is overlooked.

(C) It is assumed that staying is the same as not going.

(D) The conclusion refers to a possibility that is not explicitly referred to in any of the premises.（B）

(E) Insufficient information is given about the circumstances

这道题目也是很多人讨论过的。但还是有疑问。

Unless Elizabeth goes I must go。  应该看作 B, unless A==== neg B ------A

            or                                                       B, unless A==== neg A------B

I  not go ------Elizabeth go

Elizabeth not  go --------I  go

But she will not go if I stay.      I not go--------Elizabeth not go

                                逆否：   Elizabeth go-------- I go

但结论是       we both have to go. 是说  E go ------I go ,   I go------ E go (充分必要)吗？

所以答案是B A possible course of action is overlooked？

那这个possible overlooked course 是指   I go ------ E go 吗？

如果是这样推出来的话，那前面的Unless Elizabeth goes I must go这句话好像根本没什么作用嘛！

哦，我本来想这两个选项是矛盾的，怎么可能同时发生呢，所以就排除了。是我多想了。

3x, lawyer!