题目内容

My parents have promised to come to see me before I _________ for Africa.
A．have leftB．leaveC．leftD．will leave
B
考察时态。本题before后面仍然是一个时间状语从句，根据句意：我的父母答应在我去非洲之前来看我。用一般现在时代替将来时。
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