--- 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. must
D. may
网友回答
A. could
(答案→)B. shall
C. must
D. may
解析:句意:--我还没有参考书,但是下个月就要考这课了。--不用担心,我会让你周五前拿到书的。Could能够;shall表允诺;must一定,必须;may也许。这里表示允诺,故选B。