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 It was quite a long time ______ I figured out what had happened to the manager.
#30771
A
after
B
before
C
when 　　　　
D
since
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______ is often the case in science, there is no simple answer
#31110
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_______you’ve got a chance, you might as well make full use of it.
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#31143
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as
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that
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