The last half of the nineteenth century_____ the steady improveme_英语解答

The last half of the nineteenth century_____ the steady improvement in the means
A．has witnessed B．was witnessed
C．witnessed D．is witnessed

人气：206 ℃　时间：2019-10-23 03:20:04

解答

C.
witness在此表示见证,可以用物做主语．一般不用被动语态．本句单纯叙述一个过去的事实,所以不选A．