Amazon推出以下Kumon Workbooks优惠：
- Kumon Grade 3 Reading只卖$3.17(原价$8.95)
- Kumon Grade 3 Geometry and Measurement只卖$3.57(原价$8.95)
售完即止！另外，若你还未成为Amazon Prime会员，建议阁下可先享受首30日免费Amazon Prime会员试用
Amazon：Kumon Workbooks优惠
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