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

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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

解析结构应用本句是个复合句：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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