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Time waits for no man. But teenagers won’t realize the value of time until it’s gone.  Don’t waste your time, __________ you will regret it.

A.so B.and C.but D.or 

D

解析试题分析:考察连词辨析。So于是,表示上下文的因果关系;and和,表示上下文的并列关系;but表示转折关系。Or否则。句意:时间不等人。但是很多年轻人直到时间没有了才意识到它的价值。不要浪费你的时间,否则你会后悔的。故D正确。
考点:考察连词辨析

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