几道高中英语单选题1.Shebroughtwithherthreefriends,noneof()Ihadevermetbefore.这里为什么要用whom啊2.Whatdoyouthinkofteaching,Bob?Ifinditfunandchallenging.Itisajob()youaredoingsomethingseriousbutinteresti

　　几道高中英语单选题

　　1.Shebroughtwithherthreefriends,noneof()Ihadevermetbefore.这里为什么要用whom啊

　　2.Whatdoyouthinkofteaching,Bob?Ifinditfunandchallenging.Itisajob()youaredoingsomethingseriousbutinteresting.为什么用where不用which我觉得这是定语从句啊

　　3.（）twice,thepostmanrefusedtodeliverourlettersunlesswechainedourdog.为什么要用Bitten而不是Beingbitten