◎ 题干
The light is off. They _____.
[     ]
A. must go to bed
B. must have went to bed
C. must went to bed
D. must have gone to bed
◎ 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“The light is off. They _____. [ ]A. must go to bedB. must havewent to bedC. must went to bed D. must have gone to bed …”主要考查了你对  【情态动词】【现在完成时】  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。