题目内容

My sister met him at Ningbo Grand Theatre yesterday afternoon, so he         your lecture.
A．couldn’t attendB．mustn’t have attended
C．shouldn’t attendD．couldn’t have attended
D
从上文可知，句子叙述的是已经发生过的事情，故用完成时态，mustn’t have done表示禁止的意思，故选D，以此他不可能参加过你的演讲。
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