Our offer _____ and remains good untill 12:00 A.M. July 12, 2003, Beijing Time.
A、are firm offers
B、are firm offer
C、is firm offer
D、is a firm offer
【正确答案】:D
【题目解析】:offer是单数名词,谓语动词用单数。
Our offer _____ and remains good untill 12:00 A.M. July 12, 2003
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