found by the police the killer had to hide themselves in a mountain cave for two months

问题补充：

found by the police, the killer had to hide themselves in a mountain cave for two months.

A. In order to not be

B. In order not to be

C. So as not to be

D. So as to not be

答案：

A. In order to not be

(答案→)B. In order not to be

C. So as not to be

D. So as to not be

解析：考查目的状语。In order to 与So as to 都有“为了”之意但是位置不同， In order to 位置灵活而So as to只位于句中；不定式的否定式在不定式前加not。故选B