Make sure that all the lights on the front of the CMU do not come on.确保 CMU 前面的所有灯都不 亮。
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 the CMU do not illuminate.（亮） C.Make sure that all the lights on the behind of the CMU do not come on.正确答案B
