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


  1. A.
    of which
  2. B.
    which of
  3. C.
    of them
  4. D.
    of that
A
解析:
本题考查定语从句。“逗号”不能连接两个句子,所以所选之词应是连词,排除C项;
that不能引导非限制性定语从句,排除D;
介词应用在of前。
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(1)

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