单项选择题

A great deal has been done to remedy the situation.

A.maintain
B.improve
C.assess
D.protect
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Henry cannot resist the lure of drugs.
A.abuse
B.flavor
C.temptation
D.consumption
单项选择题
John is collaborating with Mary in writing an article.
A.cooperating
B.competing
C.combining
D.arguing
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