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The last half of the nineteenth century( )the steady improvement in the means of travel.
A.has witnessed
B.was witnessed
C.witnessed
D.is witnessed
B.was witnessed
C.witnessed
D.is witnessed
参考答案
参考解析
解析：考查过去时。句中所填动词后跟宾语，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可知，C项正确。故本题选C。句意：在十九世纪后期，旅游交通工具日益改进。
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