单选题 He has never worried about his properties because he has______them against disasters and theft.
A. assured B. ensured C. insured D. secure

【正确答案】 C
【答案解析】[解析] assure意为“向……保证;使放心”;ensure意为“担保,确保”;insure意为 “保证,保险”;secure意为“使安全;安全的”。