—Is John ing by train.
—He should，but he not.He likes driving his car.
A. must
B. can
C. need
D. may
网友回答
A. must
B. can
C. need
(答案→)D. may
解析：
e，go，leave，start等趋向动词的进行时表示将来时，所以答语是对这一将来动作做出的推断。may not“可能不，不一定”，根据he likes driving his car可以看出John可能乘火车来，也可能自己开车来。may not正好符合这一语境。must not“不准”；cannot“不可能”；need not“不必”。