______something drastic happens before midnight, the postal workers will most likely walk out on their jobs.

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问题 ______something drastic happens before midnight, the postal workers will most likely walk out on their jobs.

选项 A、Also
B、Except
C、Unless
D、Therefore

答案C

解析 something drastic happens before midnight是完整的结构，所以横线处应填入引导状语从句的从属连词。备选答案中只有(C)unless是从属连词，不用分析全句，也可以轻松找到答案。

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