He made a mistake, but then he corrected the situation _______ it got worse.
A．untilB．when
C．before D．a(chǎn)s
C
句意：他犯了一個(gè)錯(cuò)誤，但沒(méi)等形勢(shì)惡化就扭轉(zhuǎn)了局面。
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