单项选择题

The nurse treated the naughty boy very kindly, but her patience ______ at last.

A．went down
B．used up
C．got away
D．gave out
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The factory produces half a million pairs of shoes every year, 80% ______ are sold abroad.
A．of which
B．which of
C．of them
D．of that
单项选择题
John waited at the bus-stop for nearly half an hour ______ the bus finally arrived.
A．when
B．as
C．before
D．while
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