ASincethe1960s,Chinabegantoexploreandexploitoffshoreoilandgasresourcesonitsown
BBeginningfromthe1960s,Chinabegantoexploreandexploitoffshoreoilandgasresourcesonitsown
CAsearlyasthe1960s,Chinabegantoexploreandexploitoffshoreoilandgasresourcesonitsown
DUntilthe1960s,Chinabegantoexploreandexploitoffshoreoilandgasresourcesonitsown