单项选择题

A great deal has been done to better the situation.

A. change
B. improve
C. assess
D. harm
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单项选择题
They decided to abandon the saving plan after discussion.
A. give out
B. give up
C. give in
D. give off
单项选择题
The project was completed on time because the cooperation between the two companies.
A. cooperation
B. connection
C. combination
D. agreement
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