是的. 在这种情况下,第二个报价一旦被接受,就只能是一个备用合同. According to Paragraph B of the Addendum for Sale of Other Property by Buyer, 在卖方接受出售该财产的书面要约之前,卖方不得强迫第一买方放弃偶然性或根据附录终止合同.
除非备用附录是第二次要约的一部分,否则卖方不得接受第二次要约. 否则, the seller may be obligated to sell to two different buyers, especially if the first buyer waives the contingency.