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有没有这个说法:I mustn't have been a doctor.可以说mustn't`````吗?

题目详情
有没有这个说法:I mustn't have been a doctor.
可以说mustn't`````吗?
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答案和解析
没有,I mustn't 是不准的意思,加个have been a doctor是已经当上医生的意思,那就不成句子了,要说就说i mustn't be a doctor,但不能说I mustn't have been a doctor.