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．soB．a(chǎn)ndC．butD．or
D

試題分析：考察連詞辨析。So于是，表示上下文的因果關(guān)系；and和，表示上下文的并列關(guān)系；but表示轉(zhuǎn)折關(guān)系。Or否則。句意：時(shí)間不等人。但是很多年輕人直到時(shí)間沒有了才意識(shí)到它的價(jià)值。不要浪費(fèi)你的時(shí)間，否則你會(huì)后悔的。故D正確。
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