Thelasthalfofthenineteenthcentury()thesteadyimprovementinthemeansoftravel.
A.has witnessed B.was witnessed C.witnessed D.is witnessed正确答案C
Thelasthalfofthenineteenthcentury()thesteadyimprovementinthemeansoftravel.
A.has witnessed B.was witnessed C.witnessed D.is witnessed正确答案C