◎ 题干
--Who has opened the door?  ---I think it __ be Lin Tao. He’s always the first to get here.
A.is able toB.can'tC.mustD.mustn’t
◎ 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“--Who has opened the door? ---I think it __ be Lin Tao. He’s always the first to get here.A.is able toB.can'tC.mustD.mustn’t…”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。