If x is an integer, which of the following must be an even intege

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If x is an integer, which of the following must be an even integer?

A、$$x^2-x-1$$
B、$$x^2-4x+6$$
C、$$x^2-5x+5$$
D、$$x^2+3x+8$$
E、$$x^2+2x+10$$

答案：D

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