I ______a flight attendant(空中服务员) for two years now.

A. have become     B. have been      C. became        D. was

He has ________ a flight attendant for two years.

1. A.
   become
2. B.
   been
3. C.
   made
4. D.
   grown

He has ________ a flight attendant for two years.

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