题目内容
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
提示:
提示:
witness表示“目睹” ,只能用主动语态。句中19世纪后半叶是一个具体的表示过去的时间,所以用一般过去时。
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