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
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科目：高中英語 來源：專項題 題型：單選題

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

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