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、has witnessed
B、witnessed
C、is witnessed
D、has been witnessed
答案B
解析 动词“witness”的主语可以是表示时间或地点的名词词组，句子的谓语动词用主动语态。例如：1．This field has witnessed a battle．
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