—Shall I turn on the TV, Mom?
—No. You should be quiet wake up your sleeping brother.
A. so not as to
B. so as not to
C. so as to not
D. not so as to
网友回答
A. so not as to
(答案→)B. so as not to
C. so as to not
D. not so as to
解析：考查不定式：so as to do是“为了”，否定是在不定式to前面加not，表示“为了不…”,句意：--妈妈，我可以打开电视吗？--不行，为了不吵醒睡觉的弟弟，你应该保持安静。选B。