单项选择题

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
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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
单项选择题
-- ______ I didn't hear you clearly. It's too noisy here. --I was saying that the party was great.
A．Repeat.
B．Once again.
C．Sorry!
D．So what
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