单选题
The last half of the 19th century _____ the steady improvement in the means of travel.无
A、
witnessed
B、
has witnessed
C、
is witnessed
D、
was witnessed
【正确答案】
A
【答案解析】
句意: 19世纪后半叶, 旅游方式取得了稳步的发展。 The last half of the nineteenth century为具体的过去时间, 故用一般过去时; 而且其为主语, 因此用主动语态。
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