They decided to take some actions ______ the situation turned too bad.A、untilB、

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问题 They decided to take some actions ______ the situation turned too bad.

选项 A、until
B、unless
C、when
D、before

答案 D

解析 before 引导时间状语从句，意为“在……之前”，“没等……就”。如：We had already finished supper before he arrived.(在他到达之前我们已经吃完晚饭了。)

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