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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

A

解析“情態(tài)動詞＋完成式”有各自的含義。must have done表示對過去事情的肯定推測，多用于肯定句中；needn't have done表示過去本不必做的事情；shouldn't have done表示過去做了不該做的事情；can't(couldn't)have done表示對過去的否定性推測，意為“不可能”。所提供的情境My sister met him at the Grand表示他不可能參加講座。

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