摘要: My sister met him at the Grand Theatre yesterday afternoon,so he your lecture. A. couldn’t have attended B. needn’t have attended C. mustn’t have attended D. shouldn’t have attended] [解析]couldn’t have done: 不可能做某事, needn’t have done:本来不必做某事,mustn’t have done:一定未做过某事: shouldn’t have done:本不该做某事.根据提供的情境My sister met him at the Great Theatre表明他不可能参加讲座.答案是:A.

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