——How did you pass the challenging test? ——It was a long timeI found a series of suitable

——How did you pass the challenging test?
——It was a long time I found a series of suitable methods.
A. when
B. until
C. since
D. before

A. whenB. untilC. since(答案→)D. before解析：考查时间状语从句。It is a long time before...花了好久才......。句意：--你是怎样通过那么难的考试的？--我花了好久才发现了一系列的适合我的方法。故选D。

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