The last half of the 19th century ______ the steady improvement in the means of

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问题 The last half of the 19th century ______ the steady improvement in the means of travel.

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

答案 A

解析时态用法本句意为：19世纪的后半叶，旅游方式取得了稳步的发展。根据主语the last half of the nineteenth century可以判断时间为过去时，主语和谓语witness(亲眼目睹)之间是主动关系，因此A为答案。

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[originaltext]Bythemid-nineteenthcentury,theterm"icebox"hadentered