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was, since been, after was, when has been, since
have been; left had been; left am; had left come; had left
have been; went had been; went am; had been come; had been
have been, left had been, left am, had left come, had left
have been；left had been；left am；had left come；had left
went; had left had been; left have been; left have; had left
operated had been operating was operating am operating
operated had been operating was operating am operating
operated had been operating was operating am operating
for two years ago since two years ago two years after since two years later
Yes; was No; became Yes; had been No; was
ago; for before; since ago; since ago; in
have been; left had been; left am, had left come; had left
taught was teaching am teaching had been teaching
have been; left had been; left am; had left come; had left
have been；left had been；left am；had left come；had left
have been; left had been; left am; had left come; had left
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