His brother met him at the Great Theatre yesterday afternoon, so he have attended your lecture.
A. couldn’t
B. needn’t
C. mustn’t
D. shouldn’t
网友回答
(答案→)A. couldn’t
B. needn’t
C. mustn’t
D. shouldn’t
解析：考查情态动词+have done的用法：can't/ couldn't have done 根本不可能... needn't have done 本没必要,,,, must have done. 肯定已经.....(不要用mustn't have done.....) shouldn't have done 本不该......句意：昨天下午我妹妹在大剧院碰见了他，因此他肯定没有参加你的讲座。选A。