2. 考研
  3. The last half of the nineteenth century______the steady improvement in the means of travel.

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

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问题 The last half of the nineteenth century______the steady improvement in the means of travel.
选项 A、has witnessed
B、was witnessed
C、witnessed
D、is witnessed
答案C
解析 根据主语可判断出时间为过去时。
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