—Excuse me，but I haven’t got the iPhone 4 ordered through the Internet．
—Sorry madam,I’m sure you have it by this Friday．
A. must
B. may
C. could
D. shall
网友回答
A. must
B. may
C. could
(答案→)D. shall
解析：考查情态动词的用法。Shall用语二三人称表示一种语气，在这里表示允诺，句意：我确信到这周五，你可以拿到的。故选D。