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  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 本题考查时态。句中空格后有宾语，所以勿需用被动语态，另根据主语the last half of the nineteenth century“19世纪后半叶”，所以选择过去时。故选项C正确。
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