5．He looks sleepy．He musthave stayed up（熬夜了）last night，writing the essay．（stay）

分析 他看起來要睡覺．他昨晚一定熬夜寫論文了．

解答 答案：have stayed up
熬夜：stay up；句意表達的是對過去事實的肯定推測，要用情態(tài)動詞加完成時態(tài)來構(gòu)成．

點評 翻譯填空題考查的是詞匯的記憶和運用能力，平時要注意積累和運用．同時還要注意區(qū)分近義短語．

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