2. 外语
  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、is witnessed
B、was witnessed
C、witnessed
D、has witnessed
答案C
解析 题中主语“十九世纪下半叶”为过去时间，判断所述为过去发生的事，所以用过去时。
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