( ) are often used in a firm offer.
A: Our offer is open for 3 days.
B: This offer expires on March 24.
C: We offer you firm subject to your reply by 6:00 p.m. July 4.
D: This offer is subject to goods being unsold.
                    A: Our offer is open for 3 days.
B: This offer expires on March 24.
C: We offer you firm subject to your reply by 6:00 p.m. July 4.
D: This offer is subject to goods being unsold.
举一反三
- The offer is firm, subject to our receipt of your reply within ten days.
 - Our offer is subject to your reply reaching here by August 15, Beijing time. A: firm offer B: non-firm offer
 - "This offer is subject to our final confirmation."This is a firm offer.
 - This offer is firm, subject to your reply _________ us before May 30.
 - This offer is firm, subject to your reply reaching us before Oct.15.
 
