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    My parents have promised to come to see me before I _____ for Africa.

    A．have leftB．leaveC．leftD．will leave

    B

    解析试题分析：考查时态：句意：我的父母答应在我去非洲前来看我。因为还没有来看我，所以是将来的动作，但是Before引导的时间状语从句，不能用一般将来时，应该是一般现在时代替一般将来时，选B。
    考点：考查时态

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