这道题为什么不能选while?__ they decide which college to go to,students should research the admission procedures.A.As B.While C.Until D.Once这道题的答案是once,为什么不能选while?选while意思不对吗?

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这道题为什么不能选while?__ they decide which college to go to,students should research the admission procedures.A.As B.While C.Until D.Once这道题的答案是once,为什么不能选while?选while意思不对吗?

这道题为什么不能选while?__ they decide which college to go to,students should research the admission procedures.A.As B.While C.Until D.Once这道题的答案是once,为什么不能选while?选while意思不对吗?
这道题为什么不能选while?
__ they decide which college to go to,students should research the admission procedures.
A.As B.While C.Until D.Once
这道题的答案是once,为什么不能选while?选while意思不对吗?

这道题为什么不能选while?__ they decide which college to go to,students should research the admission procedures.A.As B.While C.Until D.Once这道题的答案是once,为什么不能选while?选while意思不对吗?
while有“与此同时”之意,显然本题有一个先后关系,即先决定要去的大学,再去搜索了解录取程序,所以本题只能选once,它有“一旦”之意,即一旦选好要去的大学后,就该去寻找了解录取的程序