China's GDP passed one trillion USD between Between 2005 and 2010, China's GDP increased by approximately .

China’s GDP was about $2.3 trillion in 2005 and about $6.1 trillion in 2010. The increase was approximately $6.1 trillion − $2.3 trillion = $3.8 trillion, which is closest to $4 trillion. So the correct choice is “$4 trillion.”

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