It was courteous of him to help the old lady with her bundles.

参考答案: D

参考解析: 本句意思是：他很有礼貌地帮助那个老太太扛包裹。句中courteous意为 “客气的、礼貌的”，例如：They are courteous to their guests.他们对来宾彬彬有礼。四个选项中： efficient意为“有效率的”，例如：This is a highly efficient new heating system.这是个高效的新取暖系统。respectable意为“受人尊敬的”，例如：She is a respectable married woman.她是个受人尊敬的已婚妇女。well-informed意思是“消息灵通的”，例如：He is an well-informed commentator on political events．他是一位消息灵通的政治评论员。respectful意为“有礼貌的、谦恭的”, 例如：I hope you would be more respectful to your father.我希望你对父亲有礼貌些。只有选项D 同句中画线单词含义接近。