10.Yao Ming put his effort _____ basketball training _____ a very young age.
| A．to, in | B．to, at | C．into, in | D．into, at |
10.Yao Ming put his effort _____ basketball training _____ a very young age.
| A．to, in | B．to, at | C．into, in | D．into, at |
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