---How can you keep slim as a mother of two sons?
---I _______ in the gym for years.
| A．have worked out | B．have been working out |
| C．have worked on | D．have been working on |
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---How can you keep slim as a mother of two sons?
---I _______ in the gym for years.
| A．have worked out | B．have been working out |
| C．have worked on | D．have been working on |
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