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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GCT工程硕士（英语）

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