He used to be ________ UNICEF worker, but now he is really ________ excellent basketball player.
| A．an； an | B．a； an | C．a； the | D．the； an |
He used to be ________ UNICEF worker, but now he is really ________ excellent basketball player.
| A．an； an | B．a； an | C．a； the | D．the； an |
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