问题
选择题
Tom kept quiet about the accident lose his job.
A．so not as to
B．so as not to
C．so as to not
D．not so as to
答案
答案：B
此题考查so as to的否定式的构成，其否定式是在to前加not，故选B最佳。顺便说一下，作目的状语的否定结构通常避免使用not to do来表达，而常用so as not to do（只置于句中），或in order not to do（可置于句首或句中）。