He be a history teacher.A. used to B. be used toC. use to be D. be use to

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(答案→)A. used to
B. be used to
C. use to be
D. be use to
解析：考查used to的用法。句意“他过去当过历史老师。”used to do sth.“过去常常做某事”；be used to do sth.“被用来做某事”；be used to doing sth.“习惯于做某事”。故选A。