This hospital needs ____X-ray machine, _____ machine is used for checking for patients.
| A．a,a | B．an, an |
| C．an, the | D．a, the |
This hospital needs ____X-ray machine, _____ machine is used for checking for patients.
| A．a,a | B．an, an |
| C．an, the | D．a, the |
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