一般来说，买卖双方要签署书面合同作为达成协议的凭证和执行该协议的基础。
【正确答案】：A written contract is generally signed by the seller and the buyer as the proof of the agreement and as the basis for its execution.
一般来说，买卖双方要签署书面合同作为达成协议的凭证和执行该协议的基础。
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