单选题 The chairman of the company said that new techniques had ＿＿＿＿＿＿ improved their production efficiency. 的答案

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题目内容：
The chairman of the company said that new techniques had ＿＿＿＿＿＿ improved their production efficiency.
题目选项
violently
severely
radically
extremely

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