It's (有礼貌)to say ＂thank you＂ when someone helps you.

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1. It's (有礼貌)to say ＂thank you＂ when someone helps you.

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高中英语人教版（新课程标准）2017-2018学年高一下册必修三Unit 3 The Million Pound Bank Note同步练习3