—Is your father still a doctor? —______.

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问题 —Is your father still a doctor? —______.

选项 A、Yes, he was
B、No, but he used to be
C、No, but he used to
D、He didn’t use to

答案B

解析 used to be表示“曾经是……”,与现在有对比之意。to后的be要保留。
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