题文
—When did you become a volunteer？
—I________in this group since 2008．
| A．joined |
| B．took part |
| C．have joined |
| D．have been |
—When did you become a volunteer？
—I________in this group since 2008．
| A．joined |
| B．took part |
| C．have joined |
| D．have been |
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