— I saw Mr Li at the meeting yesterday.
— Did you? He _______ have attended it, for he had asked for sick leave.
A．needn’tB．couldn’tC．shouldn’tD．mustn’t
B

試題分析：考查情態(tài)動詞用法。Needn’t have done本不需要做某事，實際上卻做了。Couldn’ t have done不可能做了某事；shouldn’t have done 本不應該做某事，實際上卻做了；句意：—昨天在會議上我看見了李先生。—是嗎？他不可能從句會議的，因為他已經(jīng)請了病假了。故B正確。
點評：Needn’t have done本不需要做某事，實際上卻做了。Couldn’ t have done不可能做了某事；shouldn’t have done 本不應該做某事，實際上卻做了；
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