问题补充：
Tom kept quiet about the accident lose his job.
A. not in order to
B. so as not to
C. in order to not
D. not so as to
答案：
A. not in order to
(答案→)B. so as not to
C. in order to not
D. not so as to
解析：不定式常修饰动词状语，表示行为的目的、结果、原因等。for+动名词一般不做目的状语，但for+名词化了的动名词可作原因状语
