where在此引导定语从句,修饰先行词cases,where的意思相当于inwhich
inthecase,inthesituation在.情况下
如:Wewilldiscussanumberofcases()beginnersofEnglishfailtousethelanguagepreperly.
A.whichB.asC.whyD.where
2.Hewasdrivingsofastastogethimselfintoadangeroussituation()heislikelytolosethecontroloverhiscar.
A.whichB.asC.whyD.where
都用where