—How was the professor's lecture?—Impressive. Thank you so much for giving me a lift during the rush hours. If not, I ________ the lecture today.A.couldn't attendB.might not have attendedC.mustn't have attendedD.can't have attended
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B解析考察情态动词的虚拟语气。根据句意可知，该句是对过去的虚拟，故排除A。句意为如果不是你给的便车，我可能就无法参加今天的讲座了。C意为禁止参加 D意为不可能参加。