单选题《泰晤士高等教育》（Times Higher Education）2009年与汤姆森路透合作进行的一项分析显示，过去20年来，学术期刊撤稿率增加了（）倍左右。A3B6C7D10
单选题
《泰晤士高等教育》（Times Higher Education）2009年与汤姆森路透合作进行的一项分析显示，过去20年来，学术期刊撤稿率增加了（）倍左右。
A
3
B
6
C
7
D
10
参考解析
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