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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, seesB.that, saw C.when, saw D.and, seeing
C
回到1998年,那时北京开始了保卫蓝色天空项目,这个城市大概只有一百天的晴空。考查非限制性定语从句,根据1998年,应为过去式。
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