◎ 题干
—Why didn't you answer my phone when I phoned you at about 11 p. m. yesterday?
—I ___________and failed to hear the phone.
A.might have sleptB.must be sleeping
C.might be sleepingD.must have been sleeping
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“—Why didn't you answer my phone when I phoned you at about 11 p. m. yesterday? —I ___________and failed to hear the phone.A.might have sleptB.must be sleepi…”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。