题目内容

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?
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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