单选题 The last half of the 19th century _________ the steady improvement in the means of travel.
  • A. was witnessed
  • B. has witnessed
  • C. witnessed
  • D. is witnessed


【正确答案】 C
【答案解析】[妙翻巧译] 19世纪的后半叶，旅游方式取得了稳步的发展。
[解析] 根据主语the last half of the 19th 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C为正确答案。