77.下列何者係屬於“Firm Offer”？
(A) This offer is valid until May 20, 2016, thereafter subject to our confirmation.
(B) This offer is subject to prior sale.
(C) This offer is subject to shipping space being available.
(D) This offer is subject to our final confirmation.

答案：登入後查看
統計： A(2), B(0), C(0), D(1), E(0) #2557113