"Gray-collar workers" refer to technicians with all of the following qualities EXCEPT: The word "vacant" in this article means

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问题 "Gray-collar workers" refer to technicians with all of the following qualities EXCEPT:
The word "vacant" in this article means ______ .

选项 A、empty
B、unfilled
C、full

答案B

解析 vacant,adj.空缺的(职位)。
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