—Is John coming by train?—He should but he not.He likes driving his car.A. must　B. canC

问题补充：

—Is John coming by train?

—He should,but he not.He likes driving his car.

A. must

B. can

C. need

D. may

答案：

A. must

B. can

C. need

(答案→)D. may

解析：分析语境可知,本题答句表示他可能不,而不表示他不可能,所以应选D不选B。