题目内容

The government decided to take some action _______ the situation turned too bad.
A．untilB．unlessC．whenD．before
D
此题考查连词。句意，政府决定在情况变坏之前采取一些措施。Until直到 unless除非 when当……时候 before在……之前，根据语境可知应选D。
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