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第1题

__________it is very late now, the researchers are still working in the lab.
A.As
B.When
C.If
D.Although
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第2题

When George was a little boy in primary school, he often _______ to school on foot.
A.goes
B.went
C.go
D.w
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第3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4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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