—— How did you pass the challenging test?
—— It was a long time       I found a series of suitable methods.
A．whenB．untilC．sinceD．before
D

試題分析：考查固定句型：句意：--你是怎么通過這個有挑戰(zhàn)性的考試的？--我們還要有一段時間才能找到一系列適合的方法。這句話用了句型：It was/will be+一段時間+before..，要多久才…，選D。
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