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单选题
If x is an integer and y=4x+3, which of the following cannot be a divisor of y?
A
5
B
6
C
7
D
9
E
23
参考答案
参考解析
解析：
将几个选项代入反解x可知，y的值不可能为6，故本题选B项。
将几个选项代入反解x可知，y的值不可能为6，故本题选B项。
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