my parents have promised to come to see me before I_____(leave)for Africa

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myparentshavepromisedtocometoseemebeforeI_____(leave)forAfricamyparentshavepromisedtocometoseemebefo

my parents have promised to come to see me before I_____(leave)for Africa
my parents have promised to come to see me before I_____(leave)for Africa

my parents have promised to come to see me before I_____(leave)for Africa
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...