It 's necessary to be prepared for a job interview( ) the answer ready will be of great help

问题描述:

It 's necessary to be prepared for a job interview( ) the answer ready will be of great help
A to have had B having had C have Dhaving
为什么不选B 要选D

描述一种事实或实际情况,并不强调时间的先后.那怎么看才知道不强调先后啊?不应该是先准备再去面试的吗?这里的意思是,去参加求职面试时,将答案准备好会有很大的帮助.