He made a mistake, but then he corrected the situation ________ it got worse.
A．untilB．whenC．beforeD．a(chǎn)s
C
考查連詞，until 直到，when 當(dāng)什么時候，before趁著，在什么之前，as 因為，句意：他犯了一個錯誤，但是后來在變得更糟糕之前他改正了這個局面。所以選C。
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