◎ 题干
—I called you at 9 last night,but no one answered.
—Sorry,I ________ sleeping.I went to bed very early.
A.need have been B.would have been
C.must have been D.should have been
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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 called you at 9 last night,but no one answered.—Sorry,I ________ sleeping.I went to bed very early.A.need have beenB.would have beenC.must have beenD.sho…”主要考查了你对  【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。