She tennis in the school team. Now she is a professional tennis player.
A:is used to play
B:is used to playing
C:used to play
某区域示意图,A,B,C为该区域中心城市的三个功能区。读图,分析回答问题。
①维生素A ②维生素B1 ③维生素C ④维生素D