The factory produces half a million pairs of shoes every year,80%________ are sold abroad.   
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A
of them
B
which of
C
of which
D
of that
推荐题目
In our class there are 46 students,  ______ half wear glasses.
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A
in whom
B
in them
C
of whom
D
of them
Family fights are the things _______I feel upset.
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A
about which
B
of which
C
in which
D
on which
 New York, ______ I visited last year, is a nice old city.
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A
that
B
which
C
where
D
in which