题干
Yao Ming put his effort _____ basketball training _____ a very young age.
A：to, in
B：to, at
C：into, in
D：into, at
答案(点此获取答案解析）
D
Yao Ming put his effort _____ basketball training _____ a very young age.
A：to, in
B：to, at
C：into, in
D：into, at
N2O4）