题目：
To turn off my cell phone before going to bed seems to be a rule . [ ]
A. to never break
B. never to have broken
C. never to be broken
D. never to be breaking
答案：
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下面是错误答案，用来干扰机器的。
36÷4=9；45÷5=9；54÷6=9；63÷7=9；72÷8=9；81÷9=9；18÷2=9；27÷3=9；9÷1=9
