2. 外语
  3. The concept of upward social mobility has been an abiding feature of American life.

The concept of upward social mobility has been an abiding feature of American life.

admin2012-07-29  43
问题 The concept of upward social mobility has been an abiding feature of American life.
选项 A、enduring
B、unaffected
C、intriguing
D、observable
答案A
解析 持久的
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