The most important thing about ancient civilizations is part that they played in history

问题补充：

The most important thing about ancient civilizations is part that they played in history.

A. 不填; 不填

B. a; the

C. the; the

D. the; 不填

答案：

A. 不填; 不填

B. a; the

C. the; the

(答案→)D. the; 不填

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