题目内容

4．You look so tired．You        have stayed up late again．（　　）
A．shouldB．canC．mayD．must

分析 你看上去如此疲倦，你肯定又熬夜了．

解答 答案D．
A项"应该；就；可能"；B项"能； 能够； 可以； 可能"；C项"可以，能够；可能"；D项"必须，一定"；  根据题干中"You look so tired"可知，你看上去比较累，因此可以推断出，你一定是又熬夜了"，"must have done"表示对过去发生的事情的肯定推测，因此D项符合语境，故选D．

点评 本题考查情态动词．解答此类题目关键是要读懂句意，并且对每个情态动词的基本用法和特殊用法都要熟知，然后根据语境辨析锁定答案．

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