单选题：Such animals as South China tigers are believed_______, for we’ve had no track o

题目内容：

Such animals as South China tigers are believed_______, for we’ve had no track of them for ages.

Abecoming extinct

Bto become extinct

Cto have been extinct

Dhaving been extinct

答案解析：

The_______ of the system of regional autonomy for ethnic minorities has undergro

The_______ of the system of regional autonomy for ethnic minorities has underground long periods of exploration and prac

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