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题目来源：
OG详解-OG7 数学2 Q10
正确答案：D
题目详解
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Choice D is correct. The given expression can be rewritten as (9x3 +6x3)+5x2 +5x+(7-5). Combining like terms in this expression yields 15x3 +5x2 +5x+2.
Choice A is incorrect and may result from conceptual or calculation errors. Choice B is incorrect and may result from conceptual or calculation errors. Choice C is incorrect and may result from conceptual or calculation errors.
Choice A is incorrect and may result from conceptual or calculation errors. Choice B is incorrect and may result from conceptual or calculation errors. Choice C is incorrect and may result from conceptual or calculation errors.
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