专四

单选题I didn't see her in the meeting-room this afternoon. She __________ at the meeting.

参考答案：D进入在线模考
【译文】今天早上我没有看见她在会议室，她不可能在会上发言了。
【解析】考查“情态动词+完成体”的用法。didn’t表明事情发生在过去，对过去情况的否定推断，要用couldn’t have done，故选D。must have done一般用于肯定句，表示对过去肯定的推测；shouldn’t have done表示“本不应做某事而做了”；needn’t have done“本不必做某事而做了”。 

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