单项选择题

A great deal has been done to remedy the situation.

A. maintain
B. improve
C. preserve
D. protect
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单项选择题
John is collaborating with Mary in writing an article.
A. cooperating
B. marrying
C. combining
D. arguing
单项选择题
Many economists have given in to the fatal lure of mathematics.
A. error
B. puzzle
C. attraction
D. contradiction
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