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(A) 2006 and the outsourcing of manufacturing by the US helps explain how China has become the largest total contributor to climate change, overtaking
(B) 2006, combined with the outsourcing of manufacturing by the US, help explain how China has become the largest total contributor to climate change, and overtook
(C) 2006, combined with the outsourcing of manufacturing by the US, helps explain how China has become the largest total contributor to climate change, overtaking
(D) 2006, combined with the fact that the US has been outsourcing its manufacturing, help explain how China has become the largest total contributor to climate change, overtaking
(E) 2006 and the outsourcing of manufacturing by the US helps in explaining China as the largest total contributor to climate change, overtaking
OA C
Source: e-GMAT













