◎ 题干
一 Look at Helen in the room.She is still working so late.
一 It _____ be Helen there. She has flown to London with her parents this morning.
[     ]
A. mustn't
B. wouldn't
C. mightn't
D. can't
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“一 Look at Helen in the room.She is still working so late. 一 It _____be Helen there. She has flown to London with her parents this morning. [ ]A. mustn't …”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。