——What’s your mother?
——She_________ a teacher, but now she is a doctor.
| A．used to be | B．was used to | C．use to be | D．is used to be |
——What’s your mother?
——She_________ a teacher, but now she is a doctor.
| A．used to be | B．was used to | C．use to be | D．is used to be |
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