—Must I make a phone call to him now?
—No, you . You write an email.
A. mustn’t; may
B. may not; must
C. shouldn’t; must
D. don’t have to; may
网友回答
A. mustn’t; may
B. may not; must
C. shouldn’t; must
(答案→)D. don’t have to; may
解析：must的否定回答，一般用needn’t或者don’t have to，据此即可判定本题选D。