◎ 题干
I ________ asleep because it took me a long time to realize that the telephone was ringing.                                    
A.could fall B.need have fallenC.must have fallen   D.may fall
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“I ________ asleep because it took me a long time to realize that the telephone was ringing.A.could fall B.need have fallenC.must have fallen D.may fall…”主要考查了你对  【虚拟语气】【情态动词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。