发布时间：2019-09-19 11:56:59
My sister met him at the Great Theatre yesterday afternoon, so it is sure that he wasn't listening to your speech at that time.
He musn't attent your speach beacause I saw him at the theatre yesterday afternoon.
My sister met him at the grand theatre yesterday afternoon, so he certainly didn't listen to your speech.
He didn't attend your lecture because my sister met him in the theatre yestday.
My sister met him at zhe Grand Theatre yesterday afternoon,so he couldn't have attenged your lecture
这里回答问题只能写，没法上传音频文件呀！