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

试题分析：句意,我父母已经答应在我去非洲之前来看我。before引导的时间状语从句，表示主句的动作发生在从句的动作之前。主句用现在完成时态，从句只能用一般现在时表示将来意义，故选B。
点评：before引导的时间状语从句，表示主句的动作发生在从句的动作之前。主句用现在完成时态，从句只能用一般现在时表示将来意义。
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