With sanctions preventing American oil companies from investing in Sudan , China has emerged as a key investor in the country , Africa 's third-largest oil producer after Nigeria , a longtime OPEC member , and Angola .
Africa /location/location/contains Sudan
Africa /location/location/contains Nigeria
Africa /location/location/contains Angola
IN NNS VBG JJ NN NNS IN VBG IN NNP , NNP VBZ VBN IN DT JJ NN IN DT NN , NNP POS JJ NN NN IN NNP , DT JJ NNP NN , CC NNP .
Africa
LOCATION
Sudan
LOCATION
/location/location/contains
Africa
LOCATION
Nigeria
LOCATION
/location/location/contains
Africa
LOCATION
Angola
LOCATION
/location/location/contains