Most of the older civilizations which flourished during the fifth century B.C. a

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问题 Most of the older civilizations which flourished during the fifth century B.C. are died out.

选项 A、they have died out
B、has died out
C、have died out
D、they had died out

答案 C

解析本句是个复合句：Most of the older civilizations是主语，后面是which引导的定语从句which flourished during the fifth century B．C．因此划线部分应是谓语动词；根据主语，谓语应用复数形式；因此选项C正确。

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