“Is John coming by train？” “He should, but he not. He likes driving his car.”A. mustB. ca

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A. must
B. can
C. need
(答案→)D. may
解析：考查情态动词。Must必须，一定；can能，能够，表客观能力；need需要；may可能，可以，语气比can弱，表推测。句意：约翰乘火车来吗？他应该是，但是他可能不。他喜欢开车。表示推测语气，故选D。