单选题
The ______ tough training given by our company creates strong and able sales representatives who perform well above others in the same field.
A、
indifferently
B、
presumably
C、
completely
D、
unbearably
【正确答案】
D
【答案解析】
本题需选择可与tough搭配的副词。tough training(高强度培训)难以忍受，故(D)unbearably(难以忍受地)最恰当。
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