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
网友回答
A. to never break
B. never to have broken
(答案→)C. never to be broken
D. never to be breaking
解析：考察句型，rule跟后面的break之间是被动关系，所以选择C
句意为，在上床前把握的手机关掉看起来是一个永远也无法打破的规定。