— I haven’t got the reference book yet, but I’ll have a test on the subject next month.
— Don’t worry. You have it by Friday.
A. could
B. shall
C. may
D. must
网友回答
A. could
(答案→)B. shall
C. may
D. must
解析：
这题考查情态动词shall的用法，shall可以用于第二、三人称表示“允诺，警告，命令”，这句话是表示允诺，句意是：别担心，你星期五可以得到它。选B。