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

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

出自：安徽理工大学-电气工程及其自动化

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