单项选择题 The company just finished ______ automated defect-removal systems in the last of its nine U.S. potato plants.to installC、 to setD、 setting

单项选择题 After years of ____ on costs and revamping the way it does business, American industry is reaping improvement in productivity.poundingC、 refiningD、 quelling

单项选择题 Cisco now handles 70% of the support calls it receives without human intervention , ______ the Web.