问题
____they decide which college to go to, students should research the admission procedures.
A:Once
B:While
C:Until
D:As
B:While
C:Until
D:As
正确答案是：
同类题型
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We forbid ________ here，Who permits you ________？[ ]
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_______ us in the discussion—I’d like to, but I’m ______ busy at themoment
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