they decide which college to go to, students should research the admission procedures.A．Once B．While C．Until D．As 题目和参考答案——青夏教育精英家教网—

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

A．Once

B．While

C．Until

D．As

解析试题分析：句意为：一旦确定要上哪所大学，学生都应该去查询这个学校的录取程序。once 一旦；While 当---什么时候，然而；until 直到----；as当---什么时候，正如----，因为----。故答案应为A。
考点：考查状语从句连词的用法。

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