单项选择题

It was not until an hour later that we heard ______ what had happened.

A．through
B．by
C．about
D．from
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单项选择题
______ fun and good exercise, swimming is a very usefull skill.
A．Beside
B．Besides
C．Except
D．Except for
单项选择题
But from the start of their experiments, the Wright brothers found that they needed money to pay _______ their research.
A．back
B．down
C．for
D．off
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