My friend's reply was courteous but firm.

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问题 My friend's reply was courteous but firm.

选项 A:efficient
B:respectable
C:well-informed
D:respectful

答案D

解析本句意思:我朋友的回复礼貌但语气坚决。courteous意思是“礼貌的,彬彬有礼的”,与 respectful(有礼貌的,恭敬的)意思相近。efficient效率高的,有能力的;respectable值得尊敬的; well-informed消息灵通的,见多识广的。
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