—I’m thinking of losing weight these days.
—Oh, you be out of your mind. You’re 50 kilograms at the most!
A. will
B. should
C. may
D. must
网友回答
A. will
B. should
C. may
(答案→)D. must
解析：本题考查情态动词的用法。由下句 “you’re 50 kilograms at the most”可以推断出来，由此可知，“你还减肥，你肯定是(must be)疯了。”