________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

解析横线后的内容是完整的句子结构，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unless是从属连词。故选C。

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