单选题
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
【正确答案】
A
【答案解析】
[考点] of的用法
[解析] of表示部分与整体的关系，关系代词which表示half a million pairs of shoes。
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