________they decide which college to go to，students should research the admission procedures.
A．As　　　　　　　　　　　　B．While
C．Until　D．Once
D
考查連詞。once在句中引導狀語從句，表示“一旦”。句意為：一旦學生決定上哪個大學，他們就應該了解一下入學手續(xù)。其他幾項不合題意。
答案：　D
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