Advertising media like direct mail, radio, television and newspapers ______ to increase the sales of industrial products.

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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,media 是medium 的复数形式。同样单复数变化的词还有bacterium—bacteria(细菌),datum--data(数据)等。
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