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[单选题]
改革开放以来，对我国经济快速增长的贡献率起着最主要作用的是（ ）
A
外国投资
B
国内需求
C
商品出口
D
购买外债
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参考答案
试题答案：
B
答案解释：
参考解析： 改革开放以来，我国经济保持快速增长，其中国内需求对经济增长的贡献率起着最主要的作用。答案为B
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