The last half of the nineteenth century_____ the steady improvement in the meansA．has witnessed B．was witnessedC．witnessed D．is witnessed
问题描述：
The last half of the nineteenth century_____ the steady improvement in the means
A．has witnessed B．was witnessed
C．witnessed D．is witnessed
答
C
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．