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. 
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A
polish up
B
take up
C
use up
D
make up
推荐题目
 The rescue team __________ 15 countries has come to aid..
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A
consists of
B
is made up of
C
consisting of
D
make up
Lack of money __________ her not continuing her studies.
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A
explains to
B
cares for
C
approves of
D
accounts for