My sister met him at the Grand Theatre yesterday afternoon, so he______ your lec

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问题 My sister met him at the Grand Theatre yesterday afternoon, so he______ your lecture.

选项 A、couldn’t have attended
B、needn’t have attended
C、mustn’t have attended
D、shouldn’t have attended

答案 A

解析情态动词题。“could not+完成时”表示对过去事情的否定推断，表示当时不可能发生某事。“need not+完成时”表示“本不必做而实际上做了”。

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