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— It's so late at night, son. For your h...

—  It's so late at night, son. For your health, avoid staying up too late________ necessary.

— I know that. But I have to hand in my history project tomorrow morning.

A.when B.although C.unless D.if

 

C 【解析】 句意:——儿子,很晚了,为了你的健康,除非有必要,不要熬夜太迟。——我知道,但是明天早上我得要交历史作业。 考查连词。when什么时候;although虽然;unless除非;if如果。根据题意,熬夜影响健康,除非有必要的话,否则就不要熬夜了,所以用unless引导条件状语从句,从句完整表达为:unless it is necessary。故选C。  
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