2. 外语
  3. Many economists believe that advertising helps increase competition, ______ leads to lower prices, thus benefiting consumers and

Many economists believe that advertising helps increase competition, ______ leads to lower prices, thus benefiting consumers and

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问题 Many economists believe that advertising helps increase competition, ______ leads to lower prices, thus benefiting consumers and the economy as a whole.
选项 A、what
B、that
C、when
D、which
答案D
解析 定语从句题。关系代词which可引导非限定性定语从句，指代句子内容。本题which指代advertising helps increase competition，故选项D正确。
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