The chairman of the company said that new techniques had______improved their pro

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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项(猛烈地，激烈地，极端地)、B项(严格地，激烈地)和C项(极端地，非常)相比，更符合句意。

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