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—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)動詞的虛擬語氣。根據(jù)句意可知，該句是對過去的虛擬，故排除A。句意為如果不是你給的便車，我可能就無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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