Most of the older civilizations which flou
题型:单项选择题
问题:
Most of the older civilizations which flourished during the fifth century B.C. are died out.
A.they have died out
B.has died out
C.have died out
D.they had died out
Most of the older civilizations which flourished during the fifth century B.C. are died out.
A.they have died out
B.has died out
C.have died out
D.they had died out