Either Perry’s faction or Tucker’s faction, but not both, will win control of the government, lf Perry’s faction wins, the nation wins, the nation will suffer economically. lf Tucker’s faction wins, the nation will suffer militarily.
Given the statements in the passage, which one of the following statements must be true?
(C)If is certain that the nation will suffer either economically or militarily, and also certain that it will not suffer both..
(D)If the nation suffers militarily, it is possible, but not certain, that Tucker’s faction has won control of the government.
正确答案是D.怎么排除C啊?
还有 either A or B和 either A or B, but not both 有什么区别? 好搞啊... | 
