It was not until all the milu deer that we realized we should build a natural park to pro

问题补充：

It was not until all the milu deer that we realized we should build a natural park to protect them.

A. died off

B. died away

C. died out

D. died down

答案：

A. died off

B. died away

(答案→)C. died out

D. died down

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