◎ 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.can C.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。