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

问题补充：

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

A. 80% of them

B. 80% of that

C. 80% of the shoes

D. 80% of which

答案：

A. 80% of them

B. 80% of that

C. 80% of the shoes

(答案→)D. 80% of which

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