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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. and               B. or                  C. but
B
and和,并且;or 或者,否则;but但是,可是。句意:时间不等人。但是年轻人直到失去时才意识到时间的价值。不要浪费时间,否则你会为此感到后悔的。结合语境可知选B。
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