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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