The factory produces half a million pairs of shoes every year, 80% ______ are sold abroad.

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问题 The factory produces half a million pairs of shoes every year, 80% ______ are sold abroad.

选项 A、of which
B、which of
C、of them
D、of that

答案A

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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