题文
As we all know，__________ Siberian tiger is __________ endangered species.
| A．/；an |
| B．the; the |
| C．a; / |
| D．the; an |
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As we all know，__________ Siberian tiger is __________ endangered species.
| A．/；an |
| B．the; the |
| C．a; / |
| D．the; an |
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