I spoke to him kindly him .
A. not to frighten
B. in order to not frighten
C. for not frightening
D. so as not to frighten
网友回答
A. not to frighten
B. in order to not frighten
C. for not frightening
(答案→)D. so as not to frighten
解析：不定式的否定式在不定式to前加not。句意：我对他和蔼的说话为的是不使他害怕。