单选题 If you ordered through an agent, please check with the agent to ______ that your order was received and processed.
【正确答案】 D
【答案解析】[分析] 形近识别 A．insane疯狂的，非常愚蠢的，毫无见识的；B．insult侮辱，凌辱；C．ensue跟着发生，继起；D．ensure确保，保证；因此D为答案。