It'snecessarytobepreparedforajobinterview.

问题详情：

It's necessary to be prepared for a job interview.________________________________________________________________________

the answers ready will be of great help.

A．To have had  B．Having had

C．Have  D．Having

【回答】

D　[句意：有必要为求职面试做好准备。准备好(如何)答复对你会很有帮助。Having the answers ready在句中作主语。 ]

知识点：非谓语动词

题型：选择题