It is polite to say thank you when someone has helped you．题目和参考答案——青夏教育精英家教网——

题目内容

1．It is polite to say"thank you"when someone has helped you．

分析当有人帮助了你的时候，说"谢谢"是有礼貌的．

解答根据对句子的分析得知，本题目有主语It、系动词是is，句子缺少一个表语，"说谢谢是有礼貌的"要用表示"礼貌的"是形容词，这是it 作形式主语的固定句式，所以答案是polite

点评这类题目要注意分析句子成分，根据所缺的句子成分写出相应的词汇，注意对词性的把握

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