My sister met him at the Grand Theater yesterday afternoon, so he lecture.
A. mustn’t have attended
B. needn’t have attended
C. couldn’t have attended
D. shouldn’t have attended
网友回答
A. mustn’t have attended
B. needn’t have attended
(答案→)C. couldn’t have attended
D. shouldn’t have attended
解析：可联系答.案.网客服索取。