问题
选择题
Don't do any other things while you are doing your homework. So please _____ your MP4.[ ]
A. turn up
B. turn down
C. turn off
D. turn on
答案
答案：C
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Don't do any other things while you are doing your homework. So please _____ your MP4.[ ]
A. turn up
B. turn down
C. turn off
D. turn on
答案：C