【题目】_____sufficient historical and legal grounds, China's position on the South China Sea has been consistent and clear.
A. Associated with B. Based on
C. Centered around D. Assessed by
在线课程【答案】B
【解析】句意：以充足的历史和法律为根基，中国在中国南海的位置已经是一贯和明确的。associated with和……有联系；based on以……为基础；centered around围绕；assessed by被评估。故判断选B。