This kind of animal has in the world.A. died awayB. died downC. died offD. died out

问题补充：

This kind of animal has in the world.

A. died away

B. died down

C. died off

D. died out

答案：

A. died away

B. died down

C. died off

(答案→)D. died out

解析：die off “凋落，相继死去”； die out“消失，变弱；灭绝”； die away和 die down都可以表示声音、光、电的“消失，变弱”。句意：这种动物已在世界上灭绝了。