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The last half of the nineteenth century ________ the steady improvement in the means of travel.

  A. has witnessed          B. was witnessed

  C. witnessed           D. is witnessed

 

答案:C
提示:

witness表示“目睹” ,只能用主动语态。句中19世纪后半叶是一个具体的表示过去的时间,所以用一般过去时。

 


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