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Sign in free to open this lesson. Lessons 1–3 of Y7 Unit 1 are free after you sign in. 免费登录就能打开这节课。登录后, Y7 第 1 单元的第 1–3 课免费。
This lesson opens with a subscription. Signed-in free accounts get Lessons 1–3 of Y7 Unit 1. 这节课订阅后开放。免费账户登录后可上 Y7 第 1 单元的第 1–3 课。