【题目】How long do you guess it will be ________ we graduate from senior high school?
A. when B. before C. until D. since
在线课程【答案】B
【解析】
试题分析：状语从句的考查。句意：你猜我们还要过多久才能高中毕业呢？这句话考查了连词before 的用法。It +be + 时段+ before + 从句 （多久之后……才）所以B为正确选项。
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