问题
单项选择题
The chairman of the company said that new techniques had ______ improved their production efficiency.
A．violently
B．severely
C．extremely
D．radically
答案
参考答案：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。