--How long ________ as an assistant here?
-- Ever since I finished middle school.
| A．are you working | B．did you work |
| C．have you been working | D．do you work |
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--How long ________ as an assistant here?
-- Ever since I finished middle school.
| A．are you working | B．did you work |
| C．have you been working | D．do you work |
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