______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,所以横线处应填人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,故选C。
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