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---We’ve seen many more days of blue skies recently.
  ---True. But back in 1998, ________ Beijing started its “Defending the Blue Sky”     program, the city only ________ about 100 days a year.  

A.which, sees B.that, saw C.when, saw D.and, seeing
科目 英语   题型 单选题   难度 较易
知识点: 从属连词
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