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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A．A novel.B．A magazine.C．A chemistry book.
A．A novel.
B．A magazine.
C．A chemistry book.
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A．On Monday.B．On Tuesday.C．On Thursday.
A．On Monday.
B．On Tuesday.
C．On Thursday.
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