每天三分鐘學英語 第57期:英文"買二送一"怎麼說?

① a 10 percent discount
② a 20 percent discount
③ half off
④ up to 70% off

⑤ buy one get one free

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⑥ buy one get one half off
⑦ buy two get one
⑧ buy three get one
⑨ 2 for 1

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