如何理解先行词为case,situation,point等的定语从句,引导词用where如:Wewilldiscussanumberofcases()beginnersofEnglishfailtousethelanguagepreperly.A.whichB.asC.whyD.where2.Hewasdrivingsofastastogethimselfin

　　如何理解先行词为case,situation,point等的定语从句,引导词用where

　　如:Wewilldiscussanumberofcases()beginnersofEnglishfailtousethelanguagepreperly.

　　A.whichB.asC.whyD.where

　　2.Hewasdrivingsofastastogethimselfintoadangeroussituation()heislikelytolosethecontroloverhiscar.

　　A.whichB.asC.whyD.where

　　两道题都选where,但是case,situation都不是地点,如何理解要选用where?thanks!