With Shanghai World Expo drawing near, volunteers are making use of every minute to ____ their foreign language because language volunteers must pass a written test and an interview.
A.polish up
B.take up
C.use up
D.make up
网友回答
A解析考查短语辨析。polish up磨练，take up从事，use up用完，make up组成，化妆，句意：随着上海世博会的临近，志愿者们正利用每一分中练他们的外语，因为语言志愿者们必须通过书面考试和面试。故选A。