每日一练：职称英语B级每日一练(2015-2-26)
【单选题】
A great deal has been done to remedy the situation
A maintain
B improve
C preserve
D protect
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每日一练：职称英语B级每日一练(2015-2-26)
【单选题】
A great deal has been done to remedy the situation
A maintain
B improve
C preserve
D protect
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