He ________ the 6:30 train because he didn't leave until 6:35 .
A.couldn'tB.may not have caughtC.can't have caughtD.mustn't catch在线课程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．
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