Advertising media like direct mail, radio, television and newspapers____to incre

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问题 Advertising media like direct mail, radio, television and newspapers____to increase the sales of industrial products.

选项 A、have been used
B、will be used
C、is being used
D、has been used

答案 A

解析根据句意，应用完成时的被动语态，句子的主语media是medium的复数形式。因此谓语也要保持一致。与medium有同样的单复数变化方式的词还有bacterium-bacteria(细菌)，datum-data(数据)等。

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