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单选题
Make sure that all the lights on the front of the CMU do not come on.
A
Make sure that some of the lights on the front of the CMU do not go out.
B
Make sure that all the lights on the front of the CMU do not illuminate.
C
Make sure that all the lights on the behind of the CMU do not come on.
答案解析
正确答案：B
