She began to play table tennis ，and became famous .
A. in the 1970’s;in her twenties
B. in 1970s;in her twenties
C. in the 1970s;in her twenty
D. in the 1970s;in the twenty
网友回答
(答案→)A. in the 1970’s;in her twenties
B. in 1970s;in her twenties
C. in the 1970s;in her twenty
D. in the 1970s;in the twenty
解析：in the 1970’s=in the 1970s定冠词不可少，意思是“20世纪70年代”；in her twenties意思是“在她20多岁时”。