单选题 A soldier has to learn to carry ______ orders as soon as they are given.
A. on B. out C. through D. off

【正确答案】 B
【答案解析】carry out意为“实现，完成”，carry out orders意为“完成命令”。A．carry on意为“进行，经营”；C．carry through意为“帮助(渡过难关等)”D．carry　off意为“赢得”。