--- Talking of travel, have you ever been to Chicago?
--- Yes. I _____ it twice while I was working in the US.
| A．have visited | B．visited |
| C．was visiting | D．would visit |
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--- Talking of travel, have you ever been to Chicago?
--- Yes. I _____ it twice while I was working in the US.
| A．have visited | B．visited |
| C．was visiting | D．would visit |
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