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求教,為什麼陳述是錯誤的

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復習邏輯學時遇到的這兩句實在想不通,來求教各位。原句是英文,為什麼這兩句陳述是錯誤的。
1.You could vote for either B or K.You have decided to vote for B .Therefore,you could not vote for K.


来自Android客户端1楼2016-10-23 23:12回复
    2.The regulation states that you must get either 3B or 2A out of the five papers for admission to this university.Now,you get both 2A and 3B,so you are not admissible according to the regulations.


    来自Android客户端2楼2016-10-23 23:16
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