the driver kept ___about the accident__lose his job

题目

the driver kept ___about the accident__lose his job
A.still,in order to not B.quiet.not so easy as
C.silent,so as not to D.calm,in order not to
希望能把这4个安静的用法写明,然后in order to 后面不加句子的对吗

答案

C这道题我做过
keep still意思是保持身体一动不动
keep calm为保持心态上的冷静
keep quiet、silent为保持安静
而保持沉默经常用keep silent
in order to 、so as to 的否定都在to之前加否定词
题意为 面对这起事故,这个司机为了保住工作而保持沉默