◎ 题干
— Listen ! There is a knock on the door. Who ________ it be?
— It must be Jack. Just now I sent for him.
[    ]
A. shall  
B. can
C. must  
D. might
◎ 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“— Listen ! There is a knock on the door. Who ________ it be?— It must be Jack. Just now I sent for him.[ ]A. shallB. canC. mustD. might…”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。