The chairman of the company said that new techniques had ______ improved their production efficiency.

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问题 The chairman of the company said that new techniques had ______ improved their production efficiency.

选项 A、violently
B、severely
C、extremely
D、radically

答案D

解析 D项(根本上、本质地)与A(猛烈地，激烈地，极端地)、B(严格地，激烈地)和C(极端地、非常地)相比，更符合句意。

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