he used to __(be) a salesman after he left university
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heusedto__(be)asalesmanafterheleftuniversityheusedto__(be)asalesmanafterheleftuniversityheusedto__(b
he used to __(be) a salesman after he left university
he used to __(be) a salesman after he left university
he used to __(be) a salesman after he left university
就是be,原型
be
就用be就ok了