______ advertising brings the economies of mass selling to the manufacturer, it produces benefits for the consumer as well.

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问题 ______ advertising brings the economies of mass selling to the manufacturer, it produces benefits for the consumer as well.

选项 A、When
B、As
C、While
D、Whereas

答案C

解析 while表示让步，也有“在……的同时”的含义。when引导时间状语从句；as引导原因或时间状语从句；whereas“而”，表示对比关系，多放在后一个句子的句首。

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