再请教一题 (GWD-2-GMAT-19):
If x is an integer, which of the following must be an odd integer?
A. 2x + 2
B. 4x + 3
C. 12x - 6
D. 13x
E. 14x
答案是D,但我觉得只要代一个2进去就知道D是错了,我觉得是B,请哪位高手指点一下?
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