31. The room is in a terrible mess; it _______ cleaned.
A.can’t have been
B.shouldn’t have been
C.mustn’t have been
D.wouldn’t have been
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◎ 知识点
根据n多题专家分析,试题“31. The room is in a terrible mess; it _______ cleaned.A.can’t have beenB.shouldn’t have been C.mustn’t have beenD.wouldn’t have been…”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。
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