单项选择题

It wasn't ______ the tiger was caught and sent to the zoo.

A．before long
B．long before
C．long after
D．long when
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单项选择题
______ the reactions of people with this drug, scientists have learned more about the brain.
A．By studying
B．To study
C．They study
D．They're studying
单项选择题
They insisted that we ______ a delegation to their country.
A．sent
B．would send
C．send
D．to send
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