---Look at the machine in the corner. I haven’t seen it before.
---It ________ examining the patient.
| A．used to | B．used for |
| C．is used to | D．is used for |
---Look at the machine in the corner. I haven’t seen it before.
---It ________ examining the patient.
| A．used to | B．used for |
| C．is used to | D．is used for |
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