题文
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 |
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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 |
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