单选题
There are still some ______ for students of science and engineering, but those in arts and humanities have been filled.
A、
positions
B、
vacancies
C、
applications
D、
categories
【正确答案】
B
【答案解析】
position职位，位子。vacancy(职位)空缺，空职。category种类，范畴。application请求，申请。
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