问题

_____ they decide whichcollege to go to, students should research the admissionprocedures.[ ]

A: As
B:While
C:Until
D:Once

正确答案是：

同类题型

The more careful you are, mistakes you’ll make.

French Foreign Minister Laurent Fabius on Monday ________ international support for his operation to help Mali quash Islamist rebels.

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_______ no ad during TV plays.—Great move! I cannot tolerate those annoying adsappearing every several minutes.

They would________if food was difficult to find.[ ]