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

admin2014-04-07  55

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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