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. and               B. or                  C. but
B
and和，并且；or 或者，否則；but但是，可是。句意：時(shí)間不等人。但是年輕人直到失去時(shí)才意識(shí)到時(shí)間的價(jià)值。不要浪費(fèi)時(shí)間，否則你會(huì)為此感到后悔的。結(jié)合語(yǔ)境可知選B。
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