问题
选择题
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
答案：D
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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：D