She is ______ new comer to _______ chemistry but she hasalready made some important discoveries.
| A．the; the | B．the; 不填 |
| C．a; 不填 | D．a; the |
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She is ______ new comer to _______ chemistry but she hasalready made some important discoveries.
| A．the; the | B．the; 不填 |
| C．a; 不填 | D．a; the |
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