【题目】________they decide which college to go to，students should research the admission procedures.
A.AsB.While
C.UntilD.Once
在线课程【答案】D
【解析】
考查连词。once在句中引导状语从句，表示“一旦”。句意为：一旦学生决定上哪个大学，他们就应该了解一下入学手续。其他几项不合题意。
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