i want to know how much does it costi want to know how much it costs 哪个是对的

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i want to know how much does it costi want to know how much it costs 哪个是对的
i want to know how much does it cost
i want to know how much it costs 哪个是对的

i want to know how much does it costi want to know how much it costs 哪个是对的
第二个句子是对的,因为宾语从句要用陈述句语序