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题目内容
（安徽理工大学-电气工程及其自动化）
Advertising media like direct mail, radio, television and newspapers _____to increase the sales of industrial products.
A、have been used
B、will be used
C、is being used
D、has been used
A、have been used
B、will be used
C、is being used
D、has been used
参考答案
