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答案：D
解析：
Choice D is correct. A linear equation in one variable will have no solution if the equation reduces to an equation of the form: ax+b=cx+d, where a=c and b≠d.
Therefore, if a=4, the equation 4x+5=4x-3 yields 5=-3. This is not true for any values of x, and therefore this value of a results in an equation with no solutions.
