问题
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
答案
A
此题考查定语从句。由于两句话之间无连词，所以只能构成定语从句；非限制性定语从句要用which指代物。
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