【正确答案】 D

【答案解析】[解析] 开车时确保系好安全带。句中ensure：确保。make out：开出，写(支票、账目等)，如：He immediately sat down and made out a cheek．他立刻坐下来开了一张支票。make for：朝…方向前进，如：The thief made for the door quickly after seeing the policeman．小偷看到警察后迅速朝门口移动。make up：构成，化妆，如：She made up her face to look prettier．她在脸上化了妆以便看上去漂亮些。make sure：确保，如：Make sure to close the door when you leave the room．确保离开房间时把门关上。只有make sure意思上和ensure最接近。