(S (S (PP (IN In) (BASENP (DT the) (JJ last) (NN four) (NNS years))) (S (BASENP (NNP China)) (VP (VBZ has) (VP (VBN become) (NP (NP (BASENP (DT a) (JJ major) (NN importer)) (PP (IN of) (BASENP (NN oil) (CC and) (NNS commodities)))) (CONJP (COMMA ,) (CC and)) (NP (BASENP (DT a) (JJ major) (NN exporter)) (PP (IN of) (BASENP (JJ finished) (NNS goods))))))))) (PERIOD .))