I have no idea where the girl could have gone to.为什么不可以+to?

I have no idea where the girl could have gone to.为什么不可以+to? I have no idea that how to make the girl I like see my heart I have no idea where the journalist could have got his infor I have no idea what to I have no idea how to where have you__,kate?I've __ to the bank.a.gone,gone b.been I have no idea learning the subject which have to pass.翻译… I have gone to Guangzhou.对Guangzhou 提问,Where have you gone?为 Where have you ____?I have ____ Beijing .A gone,gone to B be I have no idea which to buy.这里的which引导的是同位语从句吧?为什么书上说which不可 I am not sure which tie to wear for the party.I have no idea i have no idea what to do next译成中文