题文
Robert is good at playing _____ piano although he is only _____ 11-year-old boy.
| A．/,the | B．the, an | C．a, / | D．the, the |
Robert is good at playing _____ piano although he is only _____ 11-year-old boy.
| A．/,the | B．the, an | C．a, / | D．the, the |
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