The last half of the nineteenth century_____the steady improvement in the means

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问题 The last half of the nineteenth century_____the steady improvement in the means of travel.

选项 A、is witnessed
B、was witnessed
C、witnessed
D、has witnessed

答案 C

解析题中主语“十九世纪下半叶”为过去时间，判断所述为过去发生的事，所以用过去时。

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