"Gray-collar workers" refer to technicians with all of the following qualities EXCEPT: For which group of people the demand is

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问题 "Gray-collar workers" refer to technicians with all of the following qualities EXCEPT:
For which group of people the demand is more than its supply?

选项 A、gray-collar
B、white-collar
C、blue-collar

答案A

解析 倒数第二段"But demand for...the current supply."
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