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

【正确答案】 B
【答案解析】[解析] 本题需选择符合句意的形容词。将备选答案一一带入后分析全句，“为了跟上市场的不断变化”最恰当，故选择B。