关于unless和until的高一选择题
-was his father very strick with him when he was at school?
-yes.he had never praised him _____ he became one of the top students in his grade.
空里是unless和until的选择,一般区别是unless引导条件状语从句,而until引导时间状语从句,但此处觉得是条件状从,但还用had done?后面也是过去式?
那是什么语气那？