when/that 用哪个?

when/that 用哪个? it was not until when...与it was not until that...区别,强调句型用哪个. was和am该用哪个?I wish that I can travel all over the world when 定语从句用that 还是用when 用while,when,so...that造句. that 后面为什么可以用 when? 选哪个,请给出原因.A.where B.that C.when D.which 哪个对?：A day will come（ that/when） everyone will live happily. love,that was when that which when 选择题 关系词when,that 什么时候用except that 什么时候用except when