问题
选择题
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
答案
答案：C
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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
答案：C
