—Are you guys ready for “The Campus Singers Competition”?
—Sure！Since we are young, try it, _____ we will regret!
A．a(chǎn)ndB．butC．orD．then
C

試題分析：句意：你們準備好“校園歌手大賽”了嗎？---當然。既然我們還年輕，試試吧，不然，我們會后悔的。or,連詞，意思是“否則” (引導用作解釋、辯護的一件事)相當于一個條件句：if we don’t try的作用。故C正確。
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