—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 attended
C．mustn't have attendedD．can't have attended
B
考察情態(tài)動(dòng)詞的虛擬語(yǔ)氣。根據(jù)句意可知，該句是對(duì)過(guò)去的虛擬，故排除A。句意為如果不是你給的便車(chē)，我可能就無(wú)法參加今天的講座了。
C意為禁止參加 D意為不可能參加。
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