If A, then B.
If B, then C.
If C, then D.
If all of the statements above are true, which of the following must also be true?
(A) If D, then A.
(B) If not B, then not C.
(C) If not D, then not A.
(D) If D, then E.(C)
(E) If not A, then not D.
估计题目没看懂,谁能解释下意思嘛,谢谢了
逆否命题与原命题等效
如何A->B正确,那么否B->否A一定正确
这跟GMAT没什么关系
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