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

解析本题考查结构应用。本句是个复合句，分析句子成分可知，Most of the oldercivilizations是主语，且为复数。which flourished during the fifth century B．C．为定语从句，修饰主语。因此，画线部分应作句子的谓语。因此，答案是C。

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