the last half of the nineteenth century ____ the improvement
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the last half of the nineteenth century ____ the improvement in the means of travel
a.has witnessed
b.witnessed
为什么选b不选a 为什么不可以用现在完成时
a.has witnessed
b.witnessed
为什么选b不选a 为什么不可以用现在完成时
![the last half of the nineteenth century ____ the improvement](/uploads/image/z/2202849-9-9.jpg?t=the+last+half+of+the+nineteenth+century+____+the+improvement)
这是陈述过去事实,与现在无时间关联,这从主语the last half of the nineteenth century “19世纪后半叶” 可以看出
the last half of the nineteenth century ____ the improvement
The last half of the nineteenth century __the steady improve
翻译 the last half of nineteenth century wintnessed the steay
The last half of the nineteenth century_____ the steady impr
英语翻译The second half of the nineteenth century was a very imp
英语翻译In the nineteenth century,the invention of the telegraph
in the early nineteenth century.
in the second quarter of the nineteenth century
英语翻译The second half of the nineteenth centurywitnessed the f
The book in the nineteenth century.
the other half of the century是什么意思?
at the mid-nineteenth century 啥意思