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

解析考查时态和语态。句中所填动词后跟有宾语，为主动语态。因此排除表示被动的B、D两项。A、C两项的区别在于时态。根据主语the last half of the nineteenth century应选C。句意：在19世纪后期旅游交通工具日益改进。

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