The central goverment is sparing no effort to ________ the officials,overuse of power to make up a healthier party．A.keep offB.keep downC.keep outD.keep on
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B解析解析：本题考查keep构成的四个短语。keep off：（to stay away from）躲开，避开；keep down：（to prevent from growing a plishing,or succeeding）压制，镇压；阻止……成长，完成，成功；keep out:关在外，不准入内；keep to：坚持，信守。句意：中央政府正努力阻止官员滥用职权，以便建设一个更加健康的政党。