Question

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

Answer 1

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。