【单选题】【消耗次数：1】
30. It _____ quite a few years _____ the accused was declared innocent and set free.
①
was；since
②
is；that
③
willbe；when
④
was；before
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It was quite a few years before Mark Twain finally finished his last novel.
①
A．在马克·吐温完成最后一部小说之前，已经是好几年了。
②
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③
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