______ they decide which college to go to, students should research the admission procedures.

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问题 ______ they decide which college to go to, students should research the admission procedures.

选项 A、As
B、While
C、Until
D、Once

答案D

解析 根据句意一旦决定上哪所学校,学生们就应该研究一下相关的入学程序。
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