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第1题

George applied for the position three times __________he finally got it.
A.before
B.until
C.when
D.aft
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第2题

The big fire lasted as long as 24 hours _______ it was brought under control.
A.after
B.before
C.since
D.w
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第3题

_______I admit that she has shortcomings, I still like her.
A.When
B.As
C.While
D.Once
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第4题

It takes at least five years to ten years_____ it is possible to test this medicine on human patients. 　　
A.before
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