标题: Gmat&lsat上一道逻辑题求教 [打印本页] 作者: clairloo 时间: 2012-3-15 23:11 标题: Gmat&lsat上一道逻辑题求教 7. 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. (E) If not A, then not D.