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Janethasbeeninthislargecompanyformorethantwelveyears,asasalesman[A]work[B]working[C]worked[D]tohaveworked

题目详情
Janet has been in thislarge company for more than twelve years,___________ as a salesman
[A]work
[B]working
[C]worked
[D]tohave worked
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答案和解析
B 独立主格,主动用ing