Question

( )they decide which college to go to,students should research the admission procedures. A.as B.

( )they decide which college to go to,students should research the admission procedures. A.as B.while C.unitil D.once 答案给的是D那这道题翻译成“当……时”不行吗？也就是选A或B不行吗？还有Which引导的是不是一个宾语从句啊？Which在从句里做定语，那从句里的主语是谁啊？望详细分析一下句子成分，实在抱歉我没有分了，先谢谢了

Answer 1

Once (连词)+ they(主)+ decide(谓动)+ which college to go to(不定式作宾语),此句是条件状语从句;
主句为: students(主)+ should research(谓动)+ the admission procedures(宾语).
Which引导的不是一个宾语从句,而是一个不定式短语作decide的宾语; Which做定语,修饰college;
不能选A或B, 因为这儿需要一个条件状语从句, "一旦决定...", 只有Once才能引导条件状语从句.
句意: 一旦学生们决定了要上哪所大学,他们就应该研究录取程序.