my parents have promised to come to see me before I_____(leave)for Africa
问题描述：
my parents have promised to come to see me before I_____(leave)for Africa
答
应该使用一般现在时,用以在时间状语从句表达将来动作.因为从句中的leave for America 仍未发生；否则则应该说：My parents had promised to come to see me...