He ________ the 6:30 train because he didn't leave until 6:35 .

A.couldn't

B.may not have caught

C.can't have caught

D.mustn't catch

答案及解析： C

解析：

导解：既然6：35才出发，那么肯定没赶上6：30的车，用情态动词+完成式表示对过去动作的推测．