By the end of the 21st century, our country ( ) a powerful nation in the world. ( 章节：4 难度：1)
- A、will become
- B、has become
- C、is becoming
- D、will have become
正确答案:D
答案解析:有
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By the end of the 21st century, our country ( ) a powerful nation in the world. ( 章节：4 难度：1)
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