【单选题】
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
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根据网考网移动考试中心的统计,该试题:
0%的考友选择了A选项
17%的考友选择了B选项
82%的考友选择了C选项
1%的考友选择了D选项