请教LSAT-15－3－17

17.   On completing both the course in experimental design and the developmental psychology course, Angela will have earned a degree in psychology. Since experimental design, which must be completed before taking developmental psychology, will not be offered until next term, it will be at least two terms before Angela gets her psychology degree.

If the statements above are all true, which one of the following must also be true?

(A) The developmental psychology course Angela needs to take requires two terms to complete.

(B) The course in experimental design is an easier course than the course in developmental psychology.

(C) There are no prerequisites for the course in experimental design.

(D) Anyone who earns a degree in psychology form the university Angela attends will have completed the course in experimental design.（E）

(E) Once Angela completes the developmental psychology course, she will have earned a degree in psychology.

搞不懂这题要问的是哪个方面，要排除的是有可能低于两年？还是有可能高于三年，谢谢。

如果是低于两年应该是D,如果是高于三年应该是C,答案却是E

1. experimental design AND developmental psychology --> earn a degree

2.  先完成experimental design，再developmental psychology

3.  因为experimental design 是在下个学期，所以至少在拿到学位之前两个学期。

先排除无关选项ABC

根据1 的条件推理，排除D

根据2和1，选E

(C答案：原文没有说experimental design是否有prerequisites，所以不能must be true；或者你也可以认为它有prerequisites，因为要到下学期才有experimental design)

If the statements above are all true, which one of the following must also be true?

谢谢！原来是没看清题目。

还以为是If the statements above are to be true, which one of the following must also be true?,