题目内容：
根据以下材料，回答题：
Why was China Unicom's profit margin largely suppressed?
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答案解析：
填空题：根据以下材料，回答题：Why was China Unicom's profit margin largely supp
- 题目分类：英语六级
- 题目类型：填空题
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Why was China Unicom's profit margin largely suppressed?
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