be concerned about 和 concern about 什么区别?He is concerned about this problem.He concerns about this problem.

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• be concerned about和concern about的区别
• be concerned about 和 concern about 什么区别?He is concerned about this problem.He concerns about this problem.
• be concerned about和concern about的区别
• As long as you're with me enough 的中文翻译谢谢了,