根据网考网考试中心的统计分析，以下试题在2018/5/21日托业考试习题练习中，答错率较高，为：57%
【单选题】One of the reasons why our sales team has become a leader today is that they are put through a number of vigorous training sessions to keep up with the ______ changes that occur in the market.
A．prosperous
B．continuous
C．straight
D．mature
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