Please pass me the book the cover_____ ______ is red 用定语从句(一空一词)

Please pass me the book the cover_____ ______ is red 用定语从句(一空一词)
Please pass me the book the cover_____ ______ is red 用定语从句(一空一词)

Please pass me the book the cover_____ ______ is red 用定语从句(一空一词)
of which
绝对没错!不信的话你可以随便问别人!

of which

which colour

on which