The number of college graduates in a country its cultural standard nowadays.
A. reflects
B. reflect
C. are reflecting
D. have reflected
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(答案→)A. reflects
B. reflect
C. are reflecting
D. have reflected
解析：考查主谓一致。The number of 。。。的数量；做主语的时候，谓语动词用单数。Reflect反射，表达；反应；句意：一个国家大学毕业生的数量反映出这个国家的文化标准。故A正确。