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 upB．take upC．use upD．make up
A
考查短語辨析。polish up磨練，take up從事，use up用完，make up組成，化妝，句意：隨著上海世博會的臨近，志愿者們正利用每一分中練他們的外語，因為語言志愿者們必須通過書面考試和面試。故選A。
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