问题
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 attend
B: might not have attended
C: mustn’t have attended
D: can’t have attended
B: might not have attended
C: mustn’t have attended
D: can’t have attended
正确答案是：
