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______ you can sleep well, you will lose...

______ you can sleep well, you will lose the ability to focus and plan after one or two nights.

A.Once B.Unless C.If

 

B 【解析】 句意:除非你睡得好,否则一两个晚上之后你就会失去集中注意力和计划的能力。 考查连词。Once一旦;Unless除非;If如果;根据句意理解可知,you can sleep well是后句的条件,且表达的是“睡不好觉,你就会失去集中注意力的能力”,所以应该用unless,引导条件状语从句,故选B。  
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