23. 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. put up
D. make up
网友回答
(答案→)A. polish up
B. take up
C. put up
D. make up
解析：可联系答.案.网客服索取。